OpenTools

Open source AI app builders

Langfuse

93 · Healthy

Tracing, evaluation and prompt management for LLM applications and agents.

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LangWatch

89 · Healthy

Observability, evaluations and agent simulations for teams running LLM agents in production.

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88 · Healthy

AI search and chat over your company's documents, with connectors for Slack, Google Drive, Confluence and more.

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Botpress

86 · Healthy

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85 · Healthy

AI coding agent you can run yourself. Give it an issue and it edits code, runs commands and tests in a sandbox, then opens a pull request, with whichever LLM you choose.

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Autonomous coding agent for VS Code and the command line that plans changes, edits files and runs commands with your approval.

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Parlant

79 · Stable

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77 · Stable

Visual builder for AI agents and RAG workflows, with a Python API.

Free to useMIT★ 155kLast commit 3 days ago

SWE-agent

73 · Stable

Research agent that takes a GitHub issue and tries to fix it automatically with the language model of your choice.

Free to useMIT★ 21kLast commit 3 months ago

Dograh

72 · Stable

Voice AI platform for building phone agents, with a visual workflow editor, telephony support and your choice of speech and LLM providers.

Free to useBSD-2-Clause★ 5.8kLast commit yesterday

Helicone

67 · Stable

Proxy-based LLM observability that logs requests, costs and latency with one line of setup.

Free to useApache-2.0★ 6.2kLast commit 23 days ago

Aider

48 · Caution

AI pair programmer in the terminal that edits code in your git repository and commits each change.

Free to useApache-2.0★ 49kLast commit 5 months ago

Flowise

Archived

Drag-and-drop builder for LLM agents and chatflows.

Free core, paid extrasApache-2.0★ 55kLast commit 2 months ago

Source-available and unverified licenses

The code for these is public, but the license is not an OSI open source license, or we have not verified it yet. Check the license notes on each project before relying on it.

Dify

91 · Healthy

Platform for building LLM apps, agents and RAG pipelines with a visual workflow editor.

Free with conditionsDify Open Source License★ 158kLast commit yesterday

Phoenix

77 · Stable

Tracing and evaluation for LLM apps built on OpenTelemetry, with datasets and experiments.

Free, no resellingElastic License 2.0★ 12kLast commit yesterday

Langfuse

Tracing, evaluation and prompt management for LLM applications and agents.

Alternative to

Will it still be around?

Healthy

Score 93/100

Details

Can a business use it freely?

Free core, paid extras

MIT · open source (permissive)

Details
Langfuse screenshot 1

Flat Rate Deploy

Monthly cost

Langfuse on OpenTools
$39
LangSmith
$975

You save each month

$936/mo

96% less than today

Saving from month one

You save

Over 3 years
$33,696
In year one
$11,232

List price checked 9 Oct 2026 · Source · Disclaimer

Health score: 93/100

Healthy · activity, bus factor and issue responsiveness, from GitHub

Score v2 · How it works

Activity

45% weight

100/100

  • Last commit yesterday (100/100).
  • 4737 commits in the past 12 months (100/100).
  • 50+ releases in the past 12 months (100/100).

Bus factor

30% weight

94/100

  • Top contributor wrote 30% of the last 98 commits (past 12 months).
  • 17 people authored those commits.

Responsiveness

25% weight

78/100

  • 90% of all issues are closed (318 open, 2794 closed) (100/100).
  • 19 of 30 recent issues got a reply or were closed (63/100).

License

Free core, paid extras

MIT · Open source (permissive)

What you need to do

The core is free to use. Enterprise features, kept in a separately licensed part of the code, need a paid license in production.

For Langfuse

MIT, except the ee directories, which need a Langfuse license.

MIT + Langfuse Enterprise License · Open source (permissive). OSI-approved license with few conditions beyond keeping the copyright notice.

License text checked 2026-10-09 · Read it

GitHub activity

Stars
36k
Forks
4.0k
Commits, 12 mo
4.7k
last yesterday
Releases, 12 mo
50+
last yesterday
Contributors
217
17 in last 98 commits
Open issues
318
2.8k closed

Snapshot from 2026-10-09

Top contributors

Points for pull requests merged into Langfuse and reviews of them since 30 September 2026 (older history is still loading). Building something another user asked for earns more. 22 people have points on Langfuse in all.

  1. 1347 points
  2. 2300 points
  3. 3218 points
  4. 4215 points
  5. 5210 points
  6. 697 points
  7. 786 points
  8. 860 points
  9. 960 points
  10. 1050 points
Bespoke · we set it up$3,000onceFlat Rate Deploy$39/mo