Since I can't upvote your Show HN twice, I'll upvote this comment. I learned something interesting tonight from your websites. Thanks!

chibicc is a really fun idea! If I was in college, I would take a compiler course from you.

Taken from your README:

"chibicc is developed as the reference implementation for a book I'm currently writing about the C compiler and the low-level programming. The book covers the vast topic with an incremental approach; in the first chapter, readers will implement a "compiler" that accepts just a single number as a "language", which will then gain one feature at a time in each section of the book until the language that the compiler accepts matches what the C11 spec specifies. I took this incremental approach from the paper by Abdulaziz Ghuloum."