Best Free Open-Source Open Source Software

Open-source antivirus engine for detecting malware across platforms

Open-source accounting software — a self-hosted alternative to QuickBooks and Xero

Pure Javascript OCR for more than 100 Languages

A libre lightweight streaming front-end for Android

High-fidelity third-party NetEase Cloud Music player

Business Intelligence Web Application

Capture, upload, and share your screen with ease

Self‑hosted, open‑source newsletter and mailing list manager for developers

Simple videogames programming library

Postgres database for the modern web

A note-taking app with a focus on security and simplicity

Free, open-source AI voice input for desktop

GUI client for Xray, sing-box and others

Powerful open‑source debugger for Windows reverse engineering

A free, open-source note-taking app

A flexible, open-source level editor for 2D games

Learning management system for online courses

Python library for video editing

The right way to check the weather

Self‑hosted, Subsonic‑compatible music streaming server for audiophiles

Free, open‑source crypto trading bot for automated strategies

One API for 40+ providers, including OpenAI, Anthropic, and Google

Build your own AI SRE agents

Open-source collaborative wiki and documentation software