Woah! Jean-Charles Meyrignac (a.k.a. MCoder) recently released most of his old Atari ST sources:
Years ago I would have killed for that 
When I was programming demos on Atari he used to be one of my coding heroes - along with Niclas Thisell (”Nick of TCB”), God of War’s Tim Moss (”Manikin of TLB”), Steve Bak, and a few others.