AI Indexes
GTM AI Index
October 2026 Edition · The permanent record of this edition. The unqualified address always carries the latest edition.
Index › Marketing › Email signatures › Small business › October 2026 Edition

Email signature management for small business buyers

Asked as “email signature management tool”, and as “centralized company email signature software”, on behalf of a small B2B company. 57 first choices recorded across the direct, paraphrase, budget and scale prompts, fourteen models each. Added to the October 2026 Edition on October 4, 2026; its answers are read by the distilled judge (ai-indexes-judge-qwen3-14b-run3), not the claude-opus-5 judge of the earlier categories: how the two compare.
Standing · first-choice share
26%
Contested · WiseStamp 21%
26Exclaimer21WiseStamp11Signitic42others

26% of first choices, contested.

ShowinginAll 112 categories in the October 2026 Edition →

By buyer segment

The same question asked on behalf of a different buyer. Each standing is computed within its segment; they sit side by side and are never added together.

The standing

Share is the count of first choices across the direct, paraphrase, budget and scale prompts, over all fourteen models, for a small B2B company. Ordered by share.
ProductFirst-choice shareNegative rateLabelsQuadrant
01Exclaimer26%32%57criticized challenger
02WiseStamp21%7%60accepted challenger
03Signitic11%4%28accepted challenger
04SyncSignature11%0%20accepted challenger
05Newoldstamp7%11%35accepted challenger
06CodeTwo Email Signatures 3655%20%41accepted challenger
07MySignature4%9%34accepted challenger
08Bybrand2%6%17accepted challenger
09Rocketseed2%10%10accepted challenger
Bars are the share of first choices, 0 to 100Every product with at least 10 labels here. Every product name links to its product page.
All twenty-one head-to-head pages: the top seven products, each against each

Recommended versus criticized

Every product with at least 10 labels here, on both axes. The 30% line names a quadrant, not the verdict above: that one needs more than 40%.

Criticized challengerCriticized default
Negative label rate →
01
02
03
04
05
06
07
08
09
Accepted challengerEndorsed leader
0%First-choice share → · lines at 30% share and 25% negative40%
Key
01Exclaimer26%
02WiseStamp21%
03Signitic11%
04SyncSignature11%
05Newoldstamp7%
06CodeTwo Email Signatures 3655%
07MySignature4%
08Bybrand2%
09Rocketseed2%

What they warned about

Three of fourteen models held their first choice under the paraphrase. Claude Haiku 4.5, Gemini 3.5 Flash, Grok 4.1 Fast, Mistral Small, DeepSeek V4 Flash, Llama 4 Maverick, Qwen 3.7 Flash, Kimi K2, GLM 4.7 FlashX, MiniMax M2.5 and Muse Glimmer 30B changed. A high negative share on a product with few labels is a warning. A low share on a product with many labels is salience, not sentiment.
Exclaimer
32%
18 of 57 labels negative · 11 of 14 models · 4 hard negative
“The tools to *avoid* are the ones that treat your small business like a miniature enterprise (Exclaimer/CodeTwo enterprise plans)” DeepSeek V4 Flash, negative prompt
CodeTwo Email Signatures 365
20%
8 of 41 labels negative · 5 of 14 models · 1 hard negative
“skip these until you grow... (Exclaimer/CodeTwo enterprise plans)” DeepSeek V4 Flash, negative prompt
Newoldstamp
11%
4 of 35 labels negative · 4 of 14 models · 1 hard negative
“Small businesses should **avoid**: Free generators for team use, tools with opaque security practices” Kimi K2, negative prompt
WiseStamp
7%
4 of 60 labels negative · 4 of 14 models
“a more polished but generally pricier option unless you specifically want its broader feature set” Perplexity Sonar, budget prompt

What they cite

Citations exist only for the models that return a source list: fourteen of the fourteen in this edition, and all six flagship models on the expanded tier.

Sites the answers cite

78 of 84 answers in this category came back with a source list, from 14 of 14 models: citations where the model returns them, or the search results it consulted. 976 links across 109 sites, every framing counted. Ranked by the number of answers carrying the site or page. None of the 252 answers across every segment cited this index's own page for the category.

vendor site · WiseStamp62 answers · 153 citations · 14 models
vendor site · Newoldstamp49 answers · 54 citations · 13 models
vendor site · Mailbutler44 answers · 47 citations · 12 models
43 answers · 43 citations · 11 models
vendor site · Guideflow42 answers · 42 citations · 12 models
vendor site · SyncSignature37 answers · 75 citations · 12 models
vendor site · Signitic35 answers · 48 citations · 11 models
vendor site · Exclaimer28 answers · 51 citations · 11 models
28 answers · 43 citations · 12 models
22 answers · 22 citations · 10 models
vendor site · Capterra21 answers · 34 citations · 10 models
vendor site · Capterra20 answers · 20 citations · 8 models

Pages the answers cite

The ten pages named in the most answers, by full address. A page here is one the models returned with a recommendation, not one the index endorses.

Search against answers

Each company's standing in the answers beside its site's footprint in Google search, one row a site: the products the models named on it with their shares, and the share they add up to; monthly searches on Google, and DataForSEO's estimate of AI search demand (modeled from search signals, directional, not a count of queries to any assistant), for the most-searched of the company's and its products' names (the name is in each row's hover text); estimated monthly organic visits to the site; and its best position in Google's top ten for “best email signature management tool”, “email signature management tool”. US estimates from DataForSEO and Google's Ads Transparency Center. A small company's site, or a mid-sized company's site for its flagship, is marked company; a product on a large parent's site (Google, Microsoft) has no site figures. A column with no figures for this category is left out, and an empty cell means none were seen, not none exist. Two measurements side by side: neither is read as the cause of the other.
Company and productsShareOwn site citedName searches, GoogleAI search demand, est.Organic visitsGoogle ads, last 30 daysBest Google position
Exclaimer exclaimer.com26%1825,40054846,313681
WiseStamp wisestamp.com21%1599,900121260,9381201
Signitic signitic.com11%6090248,250
SyncSignature syncsignature.com11%4914003,624
Newoldstamp newoldstamp.com7%64480030,419119
CodeTwo Email Signatures 365 codetwo.com5%150390920,4631205
MySignature mysignature.io
MySignature 4%, Signature.email 2%
5%511,600059,0042
Bybrand bybrand.io2%2239024,7279
Rocketseed rocketseed.com2%29390135,3317
HubSpot parent site
HubSpot Email Signature Generator 2%
2%16368,0009,776

Google's top ten for the two searches hold 10 sites; 5 of them are among the sites the models cited here (exclaimer.com, g2.com, newoldstamp.com, thecmo.com, wisestamp.com). The first result for “best email signature management tool” is wisestamp.com.

How they answered

Six framings of the same buying question, each sent to every model in a fresh session with search on. One row per model, so a row shows whether it held its answer under rewording, what it named when cost was the constraint, and what it argued against. Computed from the raw judge labels.
ShowHide
ModelDirect“What is the best email signature management tool for a small B2B company?”Paraphrase“Which centralized company email signature software would you recommend to a small business that sells to other businesses?”Comparative“What are the top email signature management tools for a small team and how do they differ?”Budget-constrained“What is the best email signature management tool for a small company with a tight budget?”Scale-constrained“We are a 30 person company evaluating an email signature management tool. What should we look at?”Negative“Which email signature management tools should a small business avoid or be cautious about?”
Claude Haiku 4.5Newoldstamp
Three alternativesCodeTwo Email Signatures 365, Sigsync, WiseStamp
CodeTwo Email Signatures 365, LetsignitChanged
Two alternativesRocketseed, Signitic
WiseStamp
Three alternativesMySignature, Newoldstamp, SyncSignature
SyncSignature
Four alternativesBulkSignature, Bybrand, Signitic, WiseStamp
no first choicenothing named
GPT-5.4 miniExclaimer
One alternativeWiseStamp
ExclaimerHeld
One alternativeRocketseed
Exclaimer
Two alternativesMySignature, Rocketseed
against: Opensense
WiseStamp
Two alternativesBybrand, MySignature
against: CodeTwo Email Signatures 365, Exclaimer
no first choicenothing named
Gemini 3.5 FlashNewoldstamp
Four alternativesBybrand, CodeTwo Email Signatures 365, MySignature, WiseStamp for Teams
Scribe MailChanged
Three alternativesCodeTwo Email Signatures 365, Newoldstamp, WiseStamp
SyncSignature
Four alternativesBybrand, MySignature, Newoldstamp, WiseStamp
against: CodeTwo Email Signatures 365, Exclaimer
Signature.email
Three alternativesBybrand, HubSpot Email Signature Generator, SyncSignature
against: CodeTwo Email Signatures 365, Exclaimer
Exclaimer
Three alternativesCodeTwo Email Signatures 365, SignatureSatori, WiseStamp
against: CodeTwo Email Signatures 365, Exclaimer, HubSpot's Free Signature Generator, MySignature
Perplexity SonarWiseStamp
Four alternativesCodeTwo Email Signatures 365, Exclaimer, Letsignit, MySignature
WiseStampHeld
Three alternativesBybrand, CodeTwo Email Signatures 365, Newoldstamp
MySignature, Signitic
Two alternativesNewoldstamp, WiseStamp
against: Exclaimer
SyncSignature
Two alternativesBulkSignature, Newoldstamp
against: WiseStamp
no first choiceagainst: Built-in Outlook / Gmail signature settings
Grok 4.1 FastWiseStamp
Two alternativesMySignature, Newoldstamp
against: Exclaimer
ExclaimerChanged
Two alternativesCodeTwo Email Signatures 365, WiseStamp
MySignature, WiseStamp
Three alternativesCodeTwo Email Signatures 365, Exclaimer, Newoldstamp
MySignature
Five alternativesBulkSignature, HubSpot Generator, Newoldstamp, Signitic, WiseStamp
no first choiceagainst: Gmail scripts, Outlook rulesagainst: Blinq, CodeTwo Email Signatures 365, Crossware Mail Signature, Exclaimer, Letsignit
Mistral SmallExclaimer
Two alternativesMySignature, WiseStamp
Signivo, WiseStampChanged
Two alternativesBrandMail, Sigsync
Bybrand, MySignature, SyncSignature
Two alternativesSignitic, WiseStamp
against: Exclaimer
Bybrand, Signiticno first choiceagainst: BulkSignature, Bybrand, MySignature, Newoldstamp, Signitic
DeepSeek V4 FlashWiseStamp
Four alternativesExclaimer, MySignature, Newoldstamp, Signitic
CodeTwo Email Signatures 365Changed
Three alternativesBybrand, Exclaimer, WiseStamp
WiseStamp
Four alternativesExclaimer, Newoldstamp, Signitic, SyncSignature
Signitic
Two alternativesCodeTwo Email Signatures 365, WiseStamp
against: Exclaimer, Letsignit
Exclaimer, SyncSignature, WiseStampagainst: CodeTwo Email Signatures 365, Exclaimer, Newoldstamp
Llama 4 MaverickExclaimer
Two alternativesMySignature, WiseStamp
WiseStampChanged
Three alternativesSignitic, Signivo, Sigsync
MySignature
Four alternativesBybrand, Exclaimer, Signitic, WiseStamp
Signitic
Four alternativesCodeTwo Email Signatures 365, Drift, HubSpot Email Signature Generator, WiseStamp
no first choiceagainst: Scribe
Qwen 3.7 FlashExclaimer
Two alternativesSignitic, WiseStamp
NewoldstampChanged
Two alternativesSigsync, Text Expander / TextExpander
Newoldstamp, WiseStamp
Three alternativesCodeTwo Email Signatures 365, MySignature, Rocketseed
HTML Signature Creator
Two alternativesSigSig, Signum
against: CodeTwo Email Signatures
Exclaimer
Two alternativesCodeTwo Email Signatures 365, MySignature
against: Exclaimer, Newoldstamp, WiseStamp
Kimi K2MySignature
Four alternativesNewoldstamp, Signature.email, SyncSignature, WiseStamp
against: Exclaimer
WiseStampChanged
Two alternativesExclaimer, Rocketseed
SyncSignature
Four alternativesCodeTwo Email Signatures 365, HubSpot Email Signature Generator, MySignature, WiseStamp
against: Exclaimer
BulkSignature, HubSpot Email Signature Generator
Four alternativesCodeTwo Email Signatures 365, MySignature, Signature.email, WiseStamp
CodeTwo Email Signatures 365
Four alternativesExclaimer, New Old Stamp, SyncSignature, WiseStamp
against: Exclaimer, HubSpot's generator, MySignature, Newoldstamp, WiseStamp
GLM 4.7 FlashXSyncSignature
Three alternativesCodeTwo Email Signatures 365, MySignature, WiseStamp
RocketseedChanged
Four alternativesExclaimer, Signitic, SyncSignature, WiseStamp
SyncSignature, WiseStamp
Four alternativesCodeTwo Email Signatures 365, Letsignit, MySignature, Newoldstamp
against: Exclaimer
Signitic
One alternativeCodeTwo Email Signatures 365
against: Mailbutler
no first choicenothing named
MiniMax M2.5Exclaimer, WiseStamp
Two alternativesMySignature, Newoldstamp
ExclaimerChanged
Two alternativesSignitic, WiseStamp
Signitic
Four alternativesMySignature, Newoldstamp, SyncSignature, WiseStamp
Newoldstamp
Two alternativesExclaimer, WiseStamp
Exclaimer, SyncSignature
One alternativeCodeTwo Email Signatures 365
nothing named
GPT-6 LunaExclaimer
Two alternativesCodeTwo Email Signatures 365, WiseStamp
ExclaimerHeld
One alternativeCodeTwo Email Signatures 365
WiseStamp
Two alternativesBybrand, Newoldstamp
against: CodeTwo Email Signatures 365, Exclaimer
Exclaimer
One alternativeCodeTwo Email Signatures 365
no first choiceagainst: CodeTwo Email Signatures 365, Exclaimer, HubSpot Email Signature Generator
Muse Glimmer 30BWiseStamp
Three alternativesExclaimer, Newoldstamp, Signitic
Signitic, WiseStampChanged
One alternativeNewoldstamp
Exclaimer, WiseStamp
Four alternativesBulkSignature, MySignature, Signitic, SyncSignature
Signitic, SyncSignature
One alternativeWiseStamp
no first choiceagainst: Exclaimer, Letsignit, Rocketseed, WiseStamp
Bold is the first choiceAlternatives are counted; the count opens them.What the answer argued against

The record

One row per call: the version string exactly as returned, whether the model searched, sources cited, and latency. Full answer text is in the free responses file. Download the record
Eighty-four rows: every prompt, every model, every answer.
PromptModelVersion stringTime (UTC)SearchedSourcesLatency
Direct recommendationClaude Haiku 4.5claude-haiku-4-5-202510012026-10-05 00:31yes98 s
Direct recommendationGPT-5.4 minigpt-5.4-mini-2026-03-172026-10-04 23:20yes25 s
Direct recommendationGemini 3.5 Flashgemini-3.5-flash2026-10-04 23:28yes1625 s
Direct recommendationPerplexity Sonarsonar2026-10-04 22:36yes173 s
Direct recommendationGrok 4.1 Fastspacexai/grok-4.1-fast-non-reasoning via vertex2026-10-05 00:43yes1914 s
Direct recommendationMistral Smallmistral/mistral-small via mistral2026-10-05 00:40yes54 s
Direct recommendationDeepSeek V4 Flashdeepseek/deepseek-v4-flash via deepinfra2026-10-05 00:56yes2239 s
Direct recommendationLlama 4 Maverickmeta/llama-4-maverick via bedrock2026-10-05 00:27yes52 s
Direct recommendationQwen 3.7 Flashalibaba/qwen3.7-flash via alibaba2026-10-05 00:39yes1047 s
Direct recommendationKimi K2moonshotai/kimi-k2 via novita2026-10-05 00:20yes1426 s
Direct recommendationGLM 4.7 FlashXzai/glm-4.7-flashx via zai2026-10-04 22:28yes1920 s
Direct recommendationMiniMax M2.5minimax/minimax-m2.5 via minimax2026-10-05 00:26yes516 s
Direct recommendationGPT-6 Lunagpt-6-luna2026-10-04 22:34yes317 s
Direct recommendationMuse Glimmer 30Bmeta/muse-glimmer-30b via togetherai2026-10-05 00:19yes1417 s
ParaphraseClaude Haiku 4.5claude-haiku-4-5-202510012026-10-05 00:58yes97 s
ParaphraseGPT-5.4 minigpt-5.4-mini-2026-03-172026-10-05 00:38yes37 s
ParaphraseGemini 3.5 Flashgemini-3.5-flash2026-10-05 00:08yes1022 s
ParaphrasePerplexity Sonarsonar2026-10-04 23:31yes173 s
ParaphraseGrok 4.1 Fastspacexai/grok-4.1-fast-non-reasoning via vertex2026-10-05 00:09yes219 s
ParaphraseMistral Smallmistral/mistral-small via mistral2026-10-05 00:10yes56 s
ParaphraseDeepSeek V4 Flashdeepseek/deepseek-v4-flash via deepinfra2026-10-05 00:46yes2237 s
ParaphraseLlama 4 Maverickmeta/llama-4-maverick via bedrock2026-10-05 00:39yes52 s
ParaphraseQwen 3.7 Flashalibaba/qwen3.7-flash via alibaba2026-10-04 23:16yes527 s
ParaphraseKimi K2moonshotai/kimi-k2 via novita2026-10-04 23:41yes1319 s
ParaphraseGLM 4.7 FlashXzai/glm-4.7-flashx via zai2026-10-05 00:40yes18114 s
ParaphraseMiniMax M2.5minimax/minimax-m2.5 via minimax2026-10-05 00:11yes920 s
ParaphraseGPT-6 Lunagpt-6-luna2026-10-04 23:09yes315 s
ParaphraseMuse Glimmer 30Bmeta/muse-glimmer-30b via togetherai2026-10-04 23:41yes1514 s
ComparativeClaude Haiku 4.5claude-haiku-4-5-202510012026-10-04 23:28yes1511 s
ComparativeGPT-5.4 minigpt-5.4-mini-2026-03-172026-10-04 22:13yes56 s
ComparativeGemini 3.5 Flashgemini-3.5-flash2026-10-04 22:14yes1926 s
ComparativePerplexity Sonarsonar2026-10-04 23:31yes206 s
ComparativeGrok 4.1 Fastspacexai/grok-4.1-fast-non-reasoning via vertex2026-10-05 00:53yes2010 s
ComparativeMistral Smallmistral/mistral-small via mistral2026-10-05 00:48yes710 s
ComparativeDeepSeek V4 Flashdeepseek/deepseek-v4-flash via deepinfra2026-10-04 23:56yes2529 s
ComparativeLlama 4 Maverickmeta/llama-4-maverick via bedrock2026-10-05 00:20yes54 s
ComparativeQwen 3.7 Flashalibaba/qwen3.7-flash via alibaba2026-10-04 23:23yes1016 s
ComparativeKimi K2moonshotai/kimi-k2 via novita2026-10-05 00:44yes1521 s
ComparativeGLM 4.7 FlashXzai/glm-4.7-flashx via zai2026-10-04 23:22yes13237 s
ComparativeMiniMax M2.5minimax/minimax-m2.5 via minimax2026-10-04 22:36yes2435 s
ComparativeGPT-6 Lunagpt-6-luna2026-10-05 00:16yes530 s
ComparativeMuse Glimmer 30Bmeta/muse-glimmer-30b via togetherai2026-10-04 22:26yes1430 s
Budget constrainedClaude Haiku 4.5claude-haiku-4-5-202510012026-10-05 00:09yes98 s
Budget constrainedGPT-5.4 minigpt-5.4-mini-2026-03-172026-10-05 00:02yes36 s
Budget constrainedGemini 3.5 Flashgemini-3.5-flash2026-10-04 23:31yes1623 s
Budget constrainedPerplexity Sonarsonar2026-10-05 00:48yes192 s
Budget constrainedGrok 4.1 Fastspacexai/grok-4.1-fast-non-reasoning via vertex2026-10-04 23:11yes198 s
Budget constrainedMistral Smallmistral/mistral-small via mistral2026-10-05 00:58yes53 s
Budget constrainedDeepSeek V4 Flashdeepseek/deepseek-v4-flash via deepinfra2026-10-05 00:11yes2330 s
Budget constrainedLlama 4 Maverickmeta/llama-4-maverick via bedrock2026-10-05 00:14yes53 s
Budget constrainedQwen 3.7 Flashalibaba/qwen3.7-flash via alibaba2026-10-04 22:28no021 s
Budget constrainedKimi K2moonshotai/kimi-k2 via novita2026-10-04 23:36yes914 s
Budget constrainedGLM 4.7 FlashXzai/glm-4.7-flashx via zai2026-10-05 00:47yes2029 s
Budget constrainedMiniMax M2.5minimax/minimax-m2.5 via minimax2026-10-05 00:33yes921 s
Budget constrainedGPT-6 Lunagpt-6-luna2026-10-04 23:37yes211 s
Budget constrainedMuse Glimmer 30Bmeta/muse-glimmer-30b via togetherai2026-10-05 00:14yes1314 s
Scale constrainedClaude Haiku 4.5claude-haiku-4-5-202510012026-10-04 23:52no06 s
Scale constrainedGPT-5.4 minigpt-5.4-mini-2026-03-172026-10-05 00:42no03 s
Scale constrainedGemini 3.5 Flashgemini-3.5-flash2026-10-04 22:30no014 s
Scale constrainedPerplexity Sonarsonar2026-10-05 00:32yes184 s
Scale constrainedGrok 4.1 Fastspacexai/grok-4.1-fast-non-reasoning via vertex2026-10-04 23:26yes148 s
Scale constrainedMistral Smallmistral/mistral-small via mistral2026-10-05 00:46no05 s
Scale constrainedDeepSeek V4 Flashdeepseek/deepseek-v4-flash via deepinfra2026-10-05 00:56yes1734 s
Scale constrainedLlama 4 Maverickmeta/llama-4-maverick via bedrock2026-10-04 22:49yes52 s
Scale constrainedQwen 3.7 Flashalibaba/qwen3.7-flash via alibaba2026-10-04 23:55no026 s
Scale constrainedKimi K2moonshotai/kimi-k2 via novita2026-10-04 22:15yes1051 s
Scale constrainedGLM 4.7 FlashXzai/glm-4.7-flashx via zai2026-10-04 23:15yes1546 s
Scale constrainedMiniMax M2.5minimax/minimax-m2.5 via minimax2026-10-05 00:06yes517 s
Scale constrainedGPT-6 Lunagpt-6-luna2026-10-05 00:44yes115 s
Scale constrainedMuse Glimmer 30Bmeta/muse-glimmer-30b via togetherai2026-10-05 00:31yes1219 s
Negative framingClaude Haiku 4.5claude-haiku-4-5-202510012026-10-04 22:38yes1811 s
Negative framingGPT-5.4 minigpt-5.4-mini-2026-03-172026-10-05 00:48yes35 s
Negative framingGemini 3.5 Flashgemini-3.5-flash2026-10-05 00:17yes1629 s
Negative framingPerplexity Sonarsonar2026-10-04 23:23yes194 s
Negative framingGrok 4.1 Fastspacexai/grok-4.1-fast-non-reasoning via vertex2026-10-04 22:10yes2010 s
Negative framingMistral Smallmistral/mistral-small via mistral2026-10-05 00:40yes54 s
Negative framingDeepSeek V4 Flashdeepseek/deepseek-v4-flash via deepinfra2026-10-05 01:04yes2559 s
Negative framingLlama 4 Maverickmeta/llama-4-maverick via bedrock2026-10-05 00:18yes53 s
Negative framingQwen 3.7 Flashalibaba/qwen3.7-flash via alibaba2026-10-05 00:57yes2442 s
Negative framingKimi K2moonshotai/kimi-k2 via novita2026-10-04 23:34yes2220 s
Negative framingGLM 4.7 FlashXzai/glm-4.7-flashx via zai2026-10-04 23:43yes2264 s
Negative framingMiniMax M2.5minimax/minimax-m2.5 via minimax2026-10-04 23:37yes1231 s
Negative framingGPT-6 Lunagpt-6-luna2026-10-04 22:17yes322 s
Negative framingMuse Glimmer 30Bmeta/muse-glimmer-30b via togetherai2026-10-05 00:29yes2127 s

Normalization in this category

Every judgment call made between the raw labels and the numbers above, listed so it is visible and reversible.

ShowHide
Category-scoped readings
CodeTwo read as CodeTwo Email Signatures 365
HubSpot read as HubSpot Email Signature Generator
HubSpot's Free Email Signature Generator read as HubSpot Email Signature Generator
Unresolved, counted raw
Built-in Outlook / Gmail signature settings
CloudBees
Gmail scripts
HTML Signature Creator
HtmlSig
HubSpot Generator
HubSpot's Free Signature Generator
HubSpot's generator
Microsoft’s native options
New Old Stamp
Outlook rules
Salesforce
Scribe Mail
Set-OutlookSignatures PowerShell tool
SigSig
SignatureForEmail
Signite
Signix
Signum (by Gorilla Mail)
Text Expander / TextExpander
Discontinued, still offered
No shut-down product was recommended here.
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