What are some alternatives?
When comparing OpenGL and libgdx.badlogicgames.com LibGDX, you can also consider the following products
Vulkan - Vulkan is a new generation graphics and compute API that provides high-efficiency, cross-platform access to modern GPUs used in a wide variety of devices from PCs and consoles to mobile phones and embedded platforms.
Unreal Engine - Unreal Engine 4 is a suite of integrated tools for game developers to design and build games, simulations, and visualizations.
SDL - Simple DirectMedia Layer is a cross-platform multimedia library designed to provide low level...
Corona SDK - Cross-platform mobile app development.
MonoGame - MonoGame is an open source implementation of the Microsoft XNA 4 Framework.