The other two I thought of are Peter Norton and Linus Torvalds.
Fabrice, despite his tremendous contributions to the field, doesn't reach for acclaim and just seems to go his own way.
Peter Norton was a genius in his field. His book on Assembly Language was one of my favorites as a youth. Norton tools were impressive for their time.
Linus, as the namesake for Linux also made a huge impact on the field... and comes off as somewhat of an uncontrolled lunatic.
I don't though think that these three people are the highest level masters in the field. I think they are just the ones who have chosen to do things that have high impact and visibility.