Kha is game framework for the haxe language. It can be used for other things like multimedia aplications. Kha can build apps for many different targets (thanks do Haxe), like windows, mac, linux, android, ios, html5, flash and others (see https://github.com/KTXSoftware/Kha and the wiki). It has support for 2d and 3d, and vulkan is being add. Kha is very simple and portable, usually the users use its functions or build a engine on top of it.