Best Free Open-Source Customizable Software

Open-source Headless CMS

Open‑source task manager that blends time tracking, kanban and agile planning for freelancers and small teams.

Fast, flexible flat‑file CMS for developers and designers

Tiling window manager for macOS

A high‑performance, open‑source e‑commerce platform built with Python and GraphQL

A flexible, plugin-driven WYSIWYG markdown editor for the web

Cross-platform, customizable ML solutions for live and streaming media

Note-taking and database app

A note-taking application that knows programmers and Markdown better

Real-time physically based rendering

Fast, secure, efficient backup program

Open-source, flexible, and extensible low-code platform

A modern, open-source, headless CMS

All-in-one workspace for notes and knowledge management

Fast, header-only C++ logging library for high-performance applications

Open-source RSS feed generator

Your Own URL Shortener

Open‑source headless commerce platform for developers and businesses

A terminal for a more modern age

An open platform for various uses