I’m planning on building a pure GUI library for crystal after I finish my 3d game engine. The 3d Engine will serve as the rendering framework. See this forum post 3D Rendering Engine (game engine).
My original thought was to build a UI toolkit based on material design, but I’m open to suggestions.
FYI by pure I mean not binding to an existing gui library or rendering engine. Right now the only bindings I have are to opengl and glfw.