I'm looking for a Debian operating system that has no user interface, but that supports all necessary drawing libraries (OpenGL, perhaps Skia, and pixel plotting) and perhaps a lightweight HTML5 renderer that I can use to build my user interface.
It happens that existing distributions I found are already complete, so it is hard to modify them with the new user interface that I would to put over. For example, the start menu would be exactly as in Windows 8.1; the taskbar too, among many other things.
I've looked at Linux Mint, SparkyLinux... none that goes well that I can fork and easily modify. The Linux Mint Cinnamon repository does have an ui directory, but it already contains much logical code that I can easily break.
The operating system does need to support brightness adjustment too (that is, the correct graphics driver), wireless and sound drivers, among others.
Price: free
Processor: x86-64 or AMD64