zulip.com
Team chat organised by topic
Open-source group chat where every conversation has a topic, so you can catch up thread by thread instead of scrolling one stream.
Free alternative to Slack
| Resource | Pricing | Type | Licence | Platforms | Popularity | Last commit | Link |
|---|---|---|---|---|---|---|---|
| Zulip | Open source | Tool | Apache-2.0 | self-hosted | ★ 26k | 3 Oct 2026 | ✓ |
| Rocket.Chat | Open source | Tool | — | web | ★ 46k | 3 Oct 2026 | ✓ |
| Logseq | Open source | Tool | AGPL-3.0 | web | ★ 45k | 4 Oct 2026 | ✓ |
| HeyForm | Open source | Tool | AGPL-3.0 | self-hosted | ★ 9.0k | 9 Sept 2026 | ✓ |
| WeKan | Open source | Tool | MIT | web | ★ 21k | 4 Oct 2026 | ✓ |
| Taiga | Open source | Tool | MPL-2.0 | self-hosted | ★ 855 | 28 Sept 2026 | ✓ |
| Anytype | Free | Tool | — | self-hosted | ★ 8.9k | 3 Oct 2026 | ✓ |
Open-source team and customer chat
An outliner for your own knowledge base
Conversational forms, open source
A Trello-like kanban you host
Agile boards for Scrum and Kanban
Local-first, encrypted workspace
