Best Windows Free Open Source Software

GUI client for Xray, sing-box and others

Open-source client-server backup software with image and file-level restores

High‑accuracy open‑source OCR engine for developers and researchers

Libre file transfer client for cloud and server storage

Free, peer-to-peer messaging and calling app with no servers and no personal data required.

Free, open-source web app security scanner stewarded by Checkmarx.

A free, cross-platform advanced subtitle editor built for precise timing and styling.

A free, open-source RAW photo editor and workflow application built for photographers.

An encrypted messenger that runs over standard email servers instead of a proprietary network.

Free, open-source 2D animation software with vector tweening and a bone-based rig system.

Open Source Computer Vision Library

A free, open-source, cross-platform digital audio workstation for making music.

Stateless password manager

An open-source AI pair programmer for your terminal, compatible with Claude, GPT, and local LLMs.

Open-source RGB lighting software that reacts to live in-game events across 40+ titles

Python library for video editing

Mozilla's free, open-source email client with built-in calendar and deep add-on customization.

Open-source frametime capture and analysis tool built on Intel's PresentMon

Peer-to-peer encrypted messenger that works over Bluetooth, Wi-Fi, or Tor, even without internet.

Lightweight, open-source alternative to Armoury Crate for controlling ASUS gaming laptops

Free, distributed, encrypted messaging protocol with no central servers and no ads, ever.

High-fidelity third-party NetEase Cloud Music player

A fast, terminal‑based email client for developers

Capture, upload, and share your screen with ease