Zulip

Threaded open-source chat. Excellent for async NGOs, less known than Slack.

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Apache-2.0 · https://zulip.com

Chat

Self-hosted

Hosting: Self-hosted

Cloud offering exists; this dossier scores self-host.

Fair 5.0 Easy 3.3 Secure 4.0

Pillar	Criterion	Score	Evidence
Easy	Day-one UX Can non-technical staff use it without a project?	4	Threads help busy teams once explained. Source
Easy	Operate Admin burden, updates, backups and language coverage.	3	You operate the server. Source
Easy	Integrate SSO, mail/CalDAV, APIs and common NGO connectors.	3	SSO and incoming webhooks; fewer NGO plugins than Slack. Source
Fair	Lock-in / exit Can you leave with your data in open formats, at known cost?	5	Full export and import tools. 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?	5	Apache 2.0 server and clients. Source
Secure	IT security Authentication, encryption, patch cadence and independent audit.	4	Standard TLS and auth options. Source
Secure	User security 2FA, roles, phishing resistance and safe defaults.	4	2FA and guest controls exist. Source
Secure	Personal data GDPR fit: DPA, residency, sub-processors and Schrems II posture.	4	Self-host keeps member chat in your DPA scope. Source