OSS Discovery

UN
Global
PRODUCTIVITY & KNOWLEDGE
SELF-HOSTABLE
ACTIVELY MAINTAINED
FREEMIUM
Mattermost

MATTERMOST

Mattermost is a premium, open-source, self-hosted private cloud messaging platform. It prioritizes security by keeping data on-premises, ensuring compliance. While offering robust integrations, it provides tailored control, contrasting with Slack’s 2000+ integrations but limited on-prem flexibility. Ideal for enterprises demanding data sovereignty and regulatory adherence. (49 words)

GITHUB STARS
36k
+12% this month
FORKS
8.5k
Active community
LAST PUSH
Apr 24, 2026
High momentum
WATCHERS
532
Tracking updates
LICENSE
Other
Commercial use
Mattermost is a premium, open-source, self-hosted private cloud messaging platform. It prioritizes security by keeping data on-premises, ensuring compliance. While offering robust integrations, it provides tailored control, contrasting with Slack’s 2000+ integrations but limited on-prem flexibility. Ideal for enterprises demanding data sovereignty and regulatory adherence. (49 words)

High Performance

Built for speed and minimal overhead.

Self-hostable

Docker, Kubernetes, or bare metal

Developer Native

Programmable via any language workflow

SUPPORTED LANGUAGES

TypeScript
TypeScript
Go
Go
JavaScript
JavaScript
SCSS
SCSS
HTML
HTML
Shell
Shell
Makefile
Makefile
CSS
CSS
Go Template
Go Template
PLpgSQL
PLpgSQL
Dockerfile
Dockerfile
Rich Text Format
Rich Text Format
Handlebars
Handlebars

VISUAL INTERFACE

Screenshot 1
Screenshot 2
Screenshot 3

The Quick Glance

Status
Active
Category
Productivity & Knowledge
Pricing
Freemium
Self-Hosted
Yes
Available on
Windows
macOS
Linux
Latest Release
v11.6.1
Apr 21, 2026

Relative Standing — across 1,284 tools

STARS36k
Top 9% globally
FORKS8.5k
Top 3% in Open Source
ACTIVITYVery High
Top 10% Activity
WATCHERS532
Top 5% Community