Top CROSS-PLATFORM GitHub Repositories & Tools (2026)

Cross platform code coverage for .NET

The C++ Standard Library for Parallelism and Concurrency

Undetectable, Fast, Cross-Platform, Free VPN

Ethereum .Net cross platform integration library

Otter Browser aims to recreate the best aspects of the classic Opera (12.x) UI using Qt5

Fast, cross-platform and reliable multipart downloader with asynchronous progress events for .NET applications.

Pixel art editor made with Zig

Free open-source desktop app that scrapes JAV metadata and generates NFO + cover art for Jellyfin, Emby & Kodi. No Docker, no CLI — one-click install on Windows & macOS. 8 built-in sources + optional Metatube federation (30+ providers), actress collections, cross-language tag aliases, and a REST API for AI agents.

Media Player Classic Qute Theater

High-Performance Rendering Framework on Stream Architectures

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.

UniLab: A Heterogeneous Architecture for Robot RL Beyond GPU-Dominant Paradigms

Dear ImGui apps made simple: desktop, mobile, and web from one codebase. Minimal code. Maximally readable.

TreeMap is a fully downloadable app that can run on mac, windows, and linux. That visualizeses all of your disk-space into charts and square board. It also lets you delete unwanted files and opens files for you aswell.

Avogadro libraries provide 3D rendering, visualization, analysis and data processing useful in computational chemistry, molecular modeling, bioinformatics, materials science, and related areas.

Rust implementation of findutils

eepp is an open source cross-platform game and application development framework heavily focused on the development of rich graphical user interfaces.

Cross-platform 2D game engine focused on ultimate productivity built in .NET

Cross-platform open source VPN client built in Rust, with mixnet anonymity and WireGuard speed. Protects metadata, not just IP addresses. Zero-knowledge payments for unlinkable online activities.