StacksBrowseCategoriesSubmit
Star on GitHub

Tools from Product Hunt, GitHub Awesome lists, and our community, organized into practical workflows.

Star on GitHub
ExploreTool StacksBrowse ToolsCategories
ContributeSubmit a ToolSources & SelectionAbout TooolsEditorial Standards
Open sourceGitHub Repository
© 2026 TooolsLast updated
ToolsCitadel

Citadel

Groupware including email, calendar/scheduling, address books, forums, mailing lists, IM, wiki and blog engines, RSS aggregation and more. ([Source Code](https://www.citadel.org/source.html)) GPL-3.0

Communication
40views5clicks
Awesome List

About

Groupware including email, calendar/scheduling, address books, forums, mailing lists, IM, wiki and blog engines, RSS aggregation and more. ([Source Code](https://www.citadel.org/source.html)) GPL-3.0 C/Docker/Shell

Listing source: Original source. How we curate tools.

More Communication tools

Jan

An open-source alternative to ChatGPT that runs entirely offline on your computer. [![Open-Source Software][OSS Icon] ![Freeware][Freeware Icon]](https://github.com/menloresearch/jan)

Free44.9K
43views7clicks
Langfuse

LLM engineering platform for model tracing, prompt management, and application evaluation. Langfuse helps teams collaboratively debug, analyze, and iterate on their LLM applications such as chatbots o

Free35.8K
Visit Website

At a Glance

Views40
Clicks5
GitHubClosed source
PricingFree
PlatformsWeb
35
views
5clicks
Onyx Community Edition

Chat UI that works with any LLM. It comes loaded with advanced features like agents, web search, RAG, MCP, deep research, Connectors to 40+ knowledge sources, and more. ([Source Code](https://github.c

Free32.4K
37views9clicks
Apprise

Apprise allows you to send a notification to almost all of the most popular notification services available to us today such as: Telegram, Discord, Slack, Amazon SNS, Gotify, etc. MIT Python/Docker/de

Open Source16.7K
142views14clicks