# 5. Reusable open systems › 5.2 Candidate systems by Judiver… (1)

Checks 1 to 3 of 3, each with its evidence

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- **Verify 1: Chat (team) | Mattermost | Compiled binarie…**: Verify: Chat (team) | Mattermost | Compiled binaries MIT; source AGPL-3.0 (wi…
- **Verify 2: Meetings | Jitsi Meet | Apache-2.0 | Video…**: Verify: Meetings | Jitsi Meet | Apache-2.0 | Video meetings. | Long-standing.…
- **Verify 3: Code hosting | Gitea | MIT | Git hosting, i…**: Verify: Code hosting | Gitea | MIT | Git hosting, issues, pull requests, acti…
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