Framework

Very fast work possible; fast learning curve and the whole thing is always free.

MonoGame is a free and open-source C# framework based on XNA’s API. It uses Mono instead of .NET so that it can run on Windows, Mac, Linux, Playstation, XBox, Nintendo Switch, iPhone, and Android. A well known cross-platform game developed with MonoGame is Stardew Valley.

Visual UI test automation for web applications.

Great interface!

Fácil de aprender, permite reutilizar el código orientado a objetos, super rápido

Open-source and cross-platform C++ application framework especially suited for developing audio applications.