[rswier]

c4.c author here - selfie seems to fill a niche between c4 and my other more full featured compiler/os swieros. Very cool!

https://github.com/rswier/swieros/blob/master/00README.txt

[pvg]

Yep, I just meant to point out they're different. Selfie is something educators wrote for their purposes. c4.c is more like a piece of code poetry.