ntkThemed is a new implementation of Tk widgets based on OpenGL ES 2.0 and itcl-ng. For displaying texts, which are not part of OpenGL ES, a package gles2 was implemented based on FreeType fonts.
The goal behind the implementation is to have some Tk available on mobile devices like Android based or iOS based devices.
The benefit of using OpenGL ES is: it is available for Android, iOS and even as base below webgl. And OpenGL itself is a superset of OpenGL ES.
This is work in progress (WIP) and has shortly been presented on The Twentieth Annual Tcl/Tk Conference (2013) during a WIP session.