Open Source C# Software & Tools

A simple app for tracking monthly spending and working towards financial goals.

Cross-platform lossless music player with rich library management, synced lyrics, and gapless playback for Windows, macOS, and Linux.

Lightweight, fully portable PDF editor for Windows. Edit, merge, annotate, and sign PDFs locally with no subscription, accounts, or hidden telemetry anywhere.

Open source game engine that reimplements early Westwood classics including Command & Conquer: Red Alert, Tiberian Dawn, and Dune 2000.

Self-hosted, cross-platform reading server for manga, comics, and ebooks with responsive web readers and an OPDS feed.

Privacy-first password manager with built-in email aliasing. Fully encrypted and self-hostable.

Open-source, privacy-first analytics for mobile, desktop, and web apps. Anonymous event tracking, no cookies or device IDs, GDPR-compliant by default.

Free, open-source backup software that stores encrypted, incremental backups to cloud storage and remote servers.

Windows screen recorder that captures screen, audio, cursor, mouse clicks, and keystrokes.

Self-hosted web app for archiving, searching, and exporting email from multiple IMAP accounts with migration support.

PixiEditor is a universal open-source 2D editor for pixel art, painting, vector graphics, and animation. Powerful tools in a modern, friendly interface.

Bitwarden infrastructure/backend (API, database, Docker, etc).

Focalboard is an open-source, self-hosted project management tool — a free alternative to Trello, Notion, and Asana for boards, docs, and team planning.