Tools

Mattermost

Slack-like chat you can self-host. Team edition is open core.

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MIT / proprietary editions · https://mattermost.com

Chat

Self-hosted

Hosting: Self-hosted

Check which edition you run; some features are not open source.

Fair 4.3 Easy 3.7 Secure 4.0

Pillar Criterion Score Evidence
Easy Day-one UX Can non-technical staff use it without a project? 4 Feels familiar to Slack users. Source
Easy Operate Admin burden, updates, backups and language coverage. 3 You run the server and backups. Source
Easy Integrate SSO, mail/CalDAV, APIs and common NGO connectors. 4 SSO, webhooks and a plugin ecosystem. Source
Fair Lock-in / exit Can you leave with your data in open formats, at known cost? 4 Standard export and a documented migration path. Source
Fair Sovereignty EU legal entity, EU hosting, and exposure to extra-EU lawful access? 5 Self-host in the EU. Source
Fair Openness Open source or open standards? Are independent implementations possible? 4 Open core: Team edition is open, Enterprise is not. Source
Secure IT security Authentication, encryption, patch cadence and independent audit. 4 Depends on your hardening and edition. Source
Secure User security 2FA, roles, phishing resistance and safe defaults. 4 2FA and roles available. Source
Secure Personal data GDPR fit: DPA, residency, sub-processors and Schrems II posture. 4 No US SaaS if you host and avoid US plugins. Source