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An open-source AI tools directory with clear use cases, visible source freshness, and maintenance evidence for anyone deciding what to try.

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Rankings use public ecosystem signals. Treat them as a starting point, then confirm license, setup, safety, and fit with the upstream project.
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Project comparison

Book To Skill vs langchain

Compare adoption, momentum, maintenance health, and project basics before choosing which tool to evaluate deeper.

Book To Skill

Turn any technical book PDF into a Claude Code skill — ready to study, reference, and use while you work.

Best matched with other agent tools.

27.5K
Stars
+2.7K
Weekly
83/100
Health
langchain

The agent engineering platform.

Best matched with other agent tools.

147.4K
Stars
+599
Weekly
84/100
Health

Quick Take

Adoption

langchain has the larger GitHub footprint with 147.4K stars.

Momentum

Book To Skill is currently growing faster at +2.7K stars this week.

Maintenance

langchain has the stronger automated maintenance signal at 84/100. This is not a security or fit verdict.

Side-by-side evidence

Use these signals to narrow your choice, then confirm setup, license, and fit upstream.

SignalBook To Skilllangchain
Evidence statusBasic listing· 2026-10-04 09:18 UTCVerified snapshot· 2026-10-04 09:19 UTC
GitHub stars27.5K147.4K
Weekly growth+2.7K+599
Health scoreStrong83/100Strong84/100
Contributors333.7K
Commits per week11.550.5
Open issues15569
LanguagePythonPython
LicenseMITMIT
Last commit2026-08-28 19:12 UTC2026-10-03 08:31 UTC
Last releasev1.4.0langchain-core==1.4.0

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