Best Open Source Communication & Collaboration Tools in 2026

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Open Source Alternatives

OBS Studio

stars 73.1Kforks 9.3K

Record and stream with multi-source scenes and hardware encoding

Video Screen Recorders Social Media+3

Postiz

stars 31.8Kforks 5.9K

Schedule content on 20+ social networks with AI writing support

Social Media Workflow Automation AI Agents+5

Discourse

stars 47.2Kforks 8.9K

Open source forum and community platform, self-hosted

Chat CMS Self Hosted+3

Rocket.Chat

stars 45.3Kforks 13.6K

Self-hosted team chat with voice, video, and omnichannel support

Chat Self Hosted Customer Support+5

Excalidraw

stars 125.1Kforks 14K

Open source whiteboard for hand-drawn style diagrams

Diagramming UI/UX Design Graphic Design+4

Bluesky

stars 18Kforks 2.7K

Own your account and move freely across compatible servers

Social Media Self Hosted Open Core+2

Notesnook

stars 14.1Kforks 956

End-to-end encrypted open source note-taking, cross-platform

Note-taking Apps Privacy Tools Self Hosted+3

Cap

stars 18.9Kforks 1.5K

Self-hosted screen recorder with custom S3 bucket support

Screen Recorders Video macOS+4

OpenCloud

stars 5.7Kforks 221

File sync for organizations with data sovereignty and S3 storage

File Sync & Storage File Sharing Self Hosted+4

Kap

stars 19.3Kforks 888

Open source screen recorder for macOS with web tech

Screen Recorders Video macOS+2

Mautic

stars 9.8Kforks 3.3K

Self-hosted marketing automation with email and campaigns

Email Workflow Automation Self Hosted+3

WorkAdventure

stars 5.5Kforks 888

Open source 2D virtual office with proximity-based video calling

Chat Video Self Hosted+3

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