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Best Open Source Communication & Collaboration Tools in 2026

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OpenProject

stars 15.8Kforks 3.4K

Plan projects with Gantt, Scrum, and Kanban, all self-hostable

Project Management Task Management Self Hosted+3

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Dendron

stars 7.5Kforks 303

Local-first Markdown notes with hierarchy and backlinks

Note-taking Apps Knowledge Management Developer Tools+3