The best open-source Chat Helpdesk tools, curated: 19 in the registry, including Helpin, Freescout, Zammad. Every tool is open-source; each entry lists license, self-hostability, and links.
Helpin· tool, 2026-10-08 Open-source alternative to Intercom, Fin, and Linear: support, project tracking, CRM, meetings, and docs in one self-hosted workspace, with AI agents that use customer history to answer questions, keep docs in sync, and turn bug reports into pull requests.
Freescout· tool, 2026-09-28 FreeScout is a lightweight, free and open source (AGPL-3.0) help desk and shared inbox built in PHP/Laravel — a self-hosted, OSS open source alternative to Zendesk (and Help Scout) with unlimited agents, tickets and mailboxes, plus email, live chat and messaging channels.
Zammad· tool, 2026-09-28 Zammad is a web-based open source helpdesk and customer-support system (AGPL-3.0): manage tickets and conversations across email, chat, telephone and social channels. A self-hosted, OSS open source alternative to Zendesk, stewarded by the independent Zammad Foundation, with an optional commercial cloud.
LogChimp· tool, 2026-09-15 Self-hostable customer-feedback platform: track user feedback on boards and roadmaps with full brand customization, from your own dashboard. Positions itself as the open-source Canny/ProductBoard alternative. AGPL-3.0 with directory-specific exceptions. An open alternative to Featurebase.
Cossistant· tool, 2026-09-13 Open-source (AGPL-3.0) chat support for the React ecosystem: headless, code-first support components with the API-driven backend behind them, real-time messaging on a modern stack (Turborepo, Bun, Next.js, tRPC). An open alternative to Intercom for SaaS teams that want support UI they fully control.
aiogram· tool, 2026-09-03 ~5800 stars; complements python-telegram-bot, Telethon; Official Bot API framework (FSM, middleware, magic filters). Auth via bot token. No ToS risk. Complementary alt to python-telegram-bot.
bolt-python (Slack Bolt)· tool, 2026-09-03 ~1300 stars; complements python-slack-sdk; Official Slack Bolt framework (Events API, Socket Mode, slash commands). Auth via bot/app tokens + OAuth. No ToS risk.
discord.py· tool, 2026-09-03 ~16100 stars; complements serenity; Official Discord bot API wrapper. Auth via bot token. No ToS risk for bots (self-botting user accounts IS banned - don't). Proper rate limiting built in.; via ossinsight.io, GitHub cross-ref
Fider· tool, 2026-09-03 OSS alt to Featurebase; ~4458 stars; via openalternative.co
LibreChat· tool, 2026-09-03 Cleanest MIT chat platform; agents/MCP/RAG
matrix-nio· tool, 2026-09-03 ~705 stars; complements mautrix-python; Open Matrix client-server protocol with E2EE. Auth via access token/password. Open federated standard; no ToS risk.
mautrix-python· tool, 2026-09-03 ~251 stars; complements matrix-nio; Matrix framework powering the mautrix bridges (and maubot). Open protocol; appservice auth via registration token. No ToS risk on Matrix side (individual bridges to WhatsApp/Telegram carry those platforms' ToS).
python-slack-sdk· tool, 2026-09-03 ~4000 stars; complements bolt-python; Official Slack SDK (Web API, Socket Mode, SCIM, audit logs). Auth via tokens/OAuth. No ToS risk. Lower-level than Bolt.
python-telegram-bot· tool, 2026-09-03 ~29400 stars; complements Telethon, aiogram; De-facto standard on official Telegram Bot API. Auth via bot token. No ToS risk (sanctioned Bot API). LGPL-3.0.; via ossinsight.io, GitHub cross-ref
serenity· tool, 2026-09-03 ~5600 stars; complements discord.py; Official Discord API in Rust (sharding, cache, gateway). Auth via bot token. No ToS risk for bots.
signal-cli· tool, 2026-09-03 ~4800 stars; complements signald; Unofficial CLI built on official libsignal-client; registers/links a real Signal account. Widely relied-upon de-facto standard for server notifications -> finalist despite unofficial. platform-tos flagged (unsanctioned client; number could be limited). Auth via phone registration/link.
Tiledesk· tool, 2026-09-03 Live chat + LLM bot builder + human handoff