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Handpicked Open Source Alternatives to Paid Softwares

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Best Documentation Open Source Tools in 2026

Tag

Documentation

Ghostscript

stars 258forks 84

Open source PDF and PostScript interpreter and converter

Developer Tools Workflow Automation Coding+3

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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

Fusio

stars 2.1Kforks 241

Build, document, and monetize APIs from one self-hosted platform

API Infrastructure API Development Tools Developer Tools+5

OpenPDF

stars 4.3Kforks 709

Free open source Java library for creating and editing PDFs

Developer Tools API Infrastructure Workflow Automation+3

Dendron

stars 7.5Kforks 303

Local-first Markdown notes with hierarchy and backlinks

Note-taking Apps Knowledge Management Developer Tools+3