element.io
Encrypted chat on the Matrix network
Open-source Matrix client for web, desktop and mobile: end-to-end encrypted rooms that federate across servers, including one you run.
Free alternative to Slack
| Resource | Pricing | Type | Licence | Platforms | Popularity | Last commit | Link |
|---|---|---|---|---|---|---|---|
| Element | Open source | Tool | AGPL-3.0 | web · android · ios | ★ 14k | 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 | ✓ |
| Plane | Open source | Tool | AGPL-3.0 | web | ★ 60k | 1 Oct 2026 | ✓ |
| Zulip | Open source | Tool | Apache-2.0 | self-hosted | ★ 26k | 3 Oct 2026 | ✓ |
| HeyForm | Open source | Tool | AGPL-3.0 | self-hosted | ★ 9.0k | 9 Sept 2026 | ✓ |
| Formbricks | Open source | Tool | — | self-hosted | ★ 13k | 3 Oct 2026 | ✓ |
Open-source team and customer chat
An outliner for your own knowledge base
Open-source project tracking
Team chat organised by topic
Conversational forms, open source
Open-source surveys and forms
