• LeechCraft is a free open source cross-platform modular live environment.
  • Wikipedia
    • свободная кроссплатформенная модульная рабочая среда, включающая в себя браузер, IM-клиент, аудиоплеер, клиент для чтения лент новостей, BitTorrent-клиент и другие модули.
• KDAB / Mastering Cross-platform Desktop Apps
• Хабр / Пишем один «exe», который работает на 3-х разных ОС без перекомпиляции
• jart/cosmopolitan build-once run-anywhere c library
• Kotlin Multiplatform – Build Cross-Platform Apps

Wikipedia

• Category:Cross-platform software
• Haxe
  • Code written in the Haxe language can be compiled into JavaScript, C++, Java, JVM, PHP, C#, Python, Lua and Node.js. Haxe can also directly compile SWF, HashLink and NekoVM bytecode and also runs in interpreted mode.
• Kotlin (programming language)
  • Kotlin Multiplatform
• .NET
  • .NET MAUI
• List of platform-independent GUI libraries

GitHub

• openfl/openfl An open source library for creative expression on the web, desktop, mobile and consoles. Inspired by the classic Flash and AIR APIs.
• wxWidgets/wxWidgets Cross-Platform C++ GUI Library

NW.js

• Википедия
• nwjs/nw.js Call all Node.js modules directly from DOM/WebWorker and enable a new way of writing applications with all Web technologies.
• Using node-webkit to create a Desktop App

Tauri

• r/tauri
• YouTube / Fireship / Tauri in 100 Seconds

Lynx

• freeCodeCamp.org / Learn Lynx to Create JavaScript Mobile Apps Lynx is an open-source framework for creating native, cross-platform mobile applications using tools like HTML, CSS, & JS. It has a dual-threaded architecture and integrates easily with established web dev practices.