head to head · open source
Mattermost vs ejbca-ce
Mattermost has 39,517 GitHub stars, 9,090 forks, 1,012 open issues and last shipped today. ejbca-ce has 967 stars, 166 forks, 19 open issues and last shipped 2 months ago. Mattermost leads on adoption by 3,987% (39,517 vs 967 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 | ★ 40K | ★ 967 |
| License | Custom / other | LGPL-2.1 |
| Written in | TypeScript | Java |
| Last push | 2026-11-04 | 2026-09-15 |
| Forks | ⑂ 9.1K | ⑂ 166 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick Mattermost if
- You weight community size — 40K 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 that offers chat, workflow automation, voice calling, screen sharing, and AI integration. This repo is the primary source for core development on the Mattermost platform; it's written in Go and React, runs as a single Linux binary, and relies on PostgreSQL. A new compiled version is released under an MIT license every month on the 16th. Deploy Mattermost on premises, or try it for free in the cloud. Learn more about the following use cases with Mattermost: DevSecOps Incident Resolution IT Service Desk Other useful resources: Download and Install…
read the full Mattermost overview →
About ejbca-ce
EJBCA Community Note: We take the security of EJBCA and the trust of our users seriously. If you believe you have identified a security vulnerability in EJBCA, please report it responsibly by contacting us at security@primekey.com. EJBCA Community Edition is not intended for production use. For PKI production deployments, use Keyfactor EJBCA Enterprise Edition. Welcome to the EJBCA Community EJBCA is a public key infrastructure (PKI) and certificate authority (CA) solution and one of the longest running CA software projects. It is platform independent and covers the full certificate lifecycle, from enrollment…
read the full ejbca-ce overview →
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Frequently asked questions
Is Mattermost or ejbca-ce more popular?
Mattermost has 39,517 GitHub stars and ejbca-ce has 967. 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 (39,517 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.