Cross Platform GitHub Repositories (2026) · Open Source Tools

BleachBit system cleaner for Windows and Linux

🐬DeepChat - A smart assistant that connects powerful AI to your personal world

Safety-first disk cleaner and space analyzer for macOS and Windows, with duplicate cleanup, app uninstall, startup management, system optimization, and maintenance.

Argument Parser for Modern C++

Cross platform code coverage for .NET

The ultimate Geometry Dash modding framework

Cross-device clipboard sync for macOS, Windows & Linux — end-to-end encrypted, LAN-only, no cloud. OCR, CLI and MCP server built in.

A multi purpose IDE specialized in C/C++/Rust/Python/PHP and Node.js. Written in C++

Ethereum .Net cross platform integration library

AWS SDK for C++

Orkas is an open-source, local-first AI desktop app: a commander LLM directs specialist sub-agents, and runs your installed coding CLIs — Claude Code, Codex, OpenCode, OpenClaw, Hermes — as local sessions. Agents self-evolve via reflection and skill crystallization. BYO keys. macOS / Windows / Linux.

Free open-source modern C++20/23 framework to create console (CLI), forms (GUI like WinForms) and unit test (xUnit) applications and libraries on Windows, macOS, Linux, iOS, Android, FreeBSD, Haiku, and SerenityOS.

A markdown editor — and the bridge to your LLM. Local-first, MIT, ~15 MB. Bundled MCP server lets Claude Code / Codex / Cursor drive your vault directly. 14 AI providers BYOK.

C# .NET 10 Blazor habit tracker application. Works on Web, Windows, Linux, Android, iOS and macOS.

Intelligent cloud testing made easy.

C# modding swiss army knife, powered by cecil.

U++ is a C++ cross-platform rapid application development framework focused on programmer's productivity. It includes a set of libraries (GUI, SQL, Network etc.), and integrated development environment (TheIDE).

Cross-platform building blocks for .NET applications. Provides service location and dependency resolution, logging, platform-neutral images, colours and geometry, and unit test and design mode detection.

⚔️ A cross-platform, open source, and super fast MUD client with scripting in Lua

A small C# game framework