Brian Callahan
8088ify
The famous Intel 8080 CP/M 2.2 to Intel 8086/8088 MS-DOS assembly language translator.
a80
Intel 8080/Zilog Z80 assembler written in D.
cpaint
https://briancallahan.net/blog/20220220.html
oksh
Portable OpenBSD ksh, based on the Public Domain Korn Shell (pdksh).
pl0c
Self-hosting PL/0 to C compiler to teach basic compiler construction from a practical, hands-on perspective.
mg
OpenBSD Mg editor. Portable Public Domain Micro Emacs for *BSD, Cygwin, Linux, Mac OS X.
bf256
Brainfuck compiler under 256 bytes in size.
echo
Learn how argc and argv are passed from environment to Unix program.