His source is C. The links are there. Read carefully. His C and hex links are right on top of each other. Watch the status bar as you mouse over the links.
I'll probably put it on my dsPIC30F4013 and use C30 C. Or maybe on a 16F877 with PICC Lite. Or maybe on a 18F452 or 18F4620 in assembler. I have tons of different PICs. Not sure which one to use...