head to head · open source
Mattermost vs ejbca-ce
Mattermost has 39,112 GitHub stars, 9,005 forks, 1,012 open issues and last shipped yesterday. ejbca-ce has 952 stars, 160 forks, 19 open issues and last shipped 5 days ago. Mattermost leads on adoption by 4,008% (39,112 vs 952 stars). Mattermost is written in TypeScript under a custom or non-standard licence; ejbca-ce is written in Java under LGPL-2.1. Mattermost has attracted 23% as many forks as stars, ejbca-ce 17%. Mattermost was the more recently maintained of the two, and both are self-hostable with no licence fee.
Two open source projects, one decision. Both are free and self-hostable — the differences are community size, license terms, language stack and release pace.
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Side by side
| Mattermost | ejbca-ce | |
|---|---|---|
| GitHub stars | ★ 39K | ★ 952 |
| License | Custom / other | LGPL-2.1 |
| Written in | TypeScript | Java |
| Last push | 2026-09-19 | 2026-09-15 |
| Forks | ⑂ 9.0K | ⑂ 160 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick Mattermost if
- You weight community size — 39K stars and counting
- You want the Custom / other license terms
- Your stack matches TypeScript
- You value the larger contributor base for long-term maintenance
pick ejbca-ce if
- You want the ejbca-ce feature set and don't need the biggest community
- You prefer the LGPL-2.1 license terms
- Your stack matches Java
- You evaluated both and ejbca-ce fits your workflow better
About Mattermost
Mattermost is an open core, self hosted collaboration platform for teams that need secure chat, workflow automation, voice calling, screen sharing, and AI integration while keeping the deployment under their own control.
read the full Mattermost overview →
About ejbca-ce
EJBCA Community Edition is an LGPL licensed, Java based public key infrastructure and certificate authority package for anyone who wants to learn, test, or prototype certificate and PKI workflows without committing to a commercial PKI product.
read the full ejbca-ce overview →
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Frequently asked questions
Is Mattermost or ejbca-ce more popular?
Mattermost has 39,112 GitHub stars and ejbca-ce has 952. Mattermost has the larger community by that measure.
Are Mattermost and ejbca-ce free?
Both are open source. Mattermost has no licence declared in this registry, and ejbca-ce is licensed under LGPL-2.1. Both are free to self-host.
What is the difference between Mattermost and ejbca-ce?
Mattermost is written in TypeScript and ejbca-ce in Java. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, Mattermost or ejbca-ce?
Choose Mattermost if you want the larger community (39,112 stars) or its Custom / other licence terms. Choose ejbca-ce if its feature set, stack or LGPL-2.1 licence fits better. Both are self-hostable.