Modern c++17 unit testing framework on Windows, macOS, Linux, ...
Cross-platform app development framework for Java & Kotlin developers.
Build Cross-platform Applications
Asphyre is a cross-platform framework for Delphi and FreePascal.
Multiplatform data-driven test automation execution services
C++ cross plattform functional block programming
3D .NET engine for Windows, Linux, Mac
Apache Cordova framework for showing websites as mobile apps