Open Source C# Software & Tools

Self-hosted budgeting app for tracking accounts, spending, and financial goals, with bank syncing via SimpleFIN and ML-powered auto-categorization.

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

KillerPDF is a lightweight, fully portable PDF editor for Windows. Edit, merge, annotate, and sign PDFs locally with no subscription, accounts, or hidden telemetry anywhere on your computer.

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.

Captura is a Windows screen recorder that captures screen, audio, cursor, mouse clicks, and keystrokes. Lightweight, configurable, and perfect for tutorials, demos, and bug reports.

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 wrapped in a modern, friendly interface for every creator.

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 across every workflow.