Good suggestion! I found st a joy to read. Only a couple of C files, few frills and a straightforward coding style. I can see what the suckless folks are getting at.

Slightly OT here but I was thinking about what a suckless UI system would be like - one without excessive layering and as few moving parts as possible. I'm fairly sure it should be possible by avoiding truetype fonts and using the framebuffer directly. That would preclude ubiquitous animation but smooth scrolling and dragging is perfectly doable even with a single buffer.