LibGDX is a cross-platform development framework and library for creating 2D and 3D games, interactive simulations and other graphical applications. It is open-source and distributed under Apache 2 license. LibGDX provides an easy-to-use API that allows developers to quickly and easily get up and running with game development. The framework provides tools for creating graphics, sound, input, physics, networking and more. LibGDX also supports multiple platforms, including Windows, Linux, Mac, HTML5, Android and iOS, making it a great choice for developers who want to target multiple platforms with their games and applications. LibGDX is also a great choice for developers who want to learn game development, as it provides an easy-to-use API and plenty of tutorials and documentation.
Discontinued The program is no longer updated. The latest version, 0.8.4, released in May 2015, can still be downloaded from the official website.
Godot is free, open source and very cross-platform. It's already more than you need.