Allegro 5
About
Peter Wang wrote an event system that sat untouched for 5-10 years. Trent Gamblin took that and produced the first working builds of Allegro 5, the first Allegro builds with Direct3D support.
Controversy
Apparently the guys who made Factorio thought I was the idiot when they expected me to accept a patch that leaked memory. So apparently they paid everyone working on Allegro except me, the person who started the project and put in tenfold more hours than anyone else on it, fixing 95% of the bugs by buying tens of thousands of dollars worth of test equipment.
The Allegro crew then kicked me off of the GitHub page.
Rain Runner
Rain Runner was the first game made with Allegro 5, a demo written by Trent Gamblin.