Best open-source C# projects

A Japanese IME for Windows that lets you type romaji without toggling half-width/full-width mode, switching between Japanese and English automatically.

Free, open-source PDF editor for Windows with a built-in PDF 2.0 engine, offering viewing, OCR, editing, signing, and form filling without a subscription.

Open source, cross-platform, user-mode driver for drawing tablets, with a GUI and console tool, supporting Windows, Linux and macOS.

Windows tool that reads on-screen game text with OCR, translates it with AI or free services, and overlays the translation on the game.

A self-hosted media server for movies, TV series and music, aimed at a small circle of family and friends.

Sonarr is a PVR for Usenet and BitTorrent users that monitors RSS feeds for TV episodes and automatically grabs, sorts and renames them.

A native macOS menubar app showing live upload and download speeds, router bandwidth, per-app traffic and built-in speed tests.

A free, open-source, local-first Windows desktop organizer that groups desktop files into folder-backed widgets alongside notes, todos, search, and weather.

Windows app for low-latency iPhone and iPad screen mirroring over USB or AirPlay, with D3D11 preview, multi-device sessions and OBS window capture.