OpenBSD has two new C compilers: chibicc and kefir
Is it just me, or is the first time that "OpenBSD" and "New" were in the same sentence?  I love OpenBSD, but in fairness, its biggest virtue is usually its rock solid stability and security, derived from everything in it generally being long battle tested before ever going into OpenBSD.  The idea of bleeding edge C compilers seems a bit strange, given that reputation.