I'm really not very good at platformer games and I usually find them quite tedious but there was a time when they hit their peak on PC and they were fantastic. The best publisher in those days was called Apogee (though Epic started to get involved later) and I completed quite a few of their games.
Monster Bash
Commander Keen
Gods
Duke Nukem 1
Alley Cat
Bio Menace
Captain Comic
Commander Keen 1-6
Cosmo's Cosmic Adventure
Crystal Caves
Duke Nukem 1-6
Cosmo
Gods
Hocus Pocus
Halloween Harry
Jill of the Jungle
Monster Bash
Monuments of Mars
Pharaoh's Tomb
Secret Agent