Huly vs Mattermost

Comparing two open source alternatives to Slack . Use the comparison below to decide which one fits your needs.

Huly

AGPL-3.0

All-in-one open source platform that combines project management, CRM, chat, HR, and wiki as an alternative to Linear, Jira, Slack, and Notion.

Mattermost is an open source platform for secure collaboration across the entire software development lifecycle..

	Huly	Mattermost
License	AGPL-3.0	—
Self-hostable	Yes	No
GitHub Stars	26,283	38,114
Forks	1,937	8,758
Open Issues	841	920
Last Commit	Jun 22, 2026	Jun 19, 2026
First Released	Aug 2, 2021	Jun 15, 2015
Categories	Project Management Team Chat & Messaging Tools Wiki Software Customer Relationship Management Tools	Team Chat & Messaging Tools
Tags	—	—

Open source Notion alternative that brings projects, wikis, and teams together with AI while keeping you in control of your data.

A fast, privacy-first local markdown note-taking app built with Tauri and SvelteKit. Your notes stay as plain .md files on your device.

Lightweight self-hosted app for managing personal file-based notes and checklists.

Low-latency, open-source voice chat built for gaming — self-host your own server with no subscription required.

Open-source project management platform — an alternative to Jira, Linear, Monday, and ClickUp.

Open-source design and prototyping tool for cross-domain teams — a self-hostable alternative to Figma.