True20 probably should have made #5 to be honest.
Its a mutant cross between Mutants and Masterminds 1st Edition, the generic classes from D20 Unearthed Arcana using the Complete Psychics Handbook from Green Ronin as its magic system
It has many settings SF, Fantasy, Horror, Modern you name it a variant (its predecessor Blue Rose) and support for most things a GM or player needs.
It fills a similar niche to Savage Worlds though I vastly prefer True20 . YMMV of course
Alas its not that popular anymore and the system is pretty moribund
Its too bad as I would have liked to see what other cool stuff came out and its signature horror setting "The Razor in the Apple" made into a full book
The Return of Planescape? - Curious. There is a brief note on this 'countdown' at Enworld.
15 hours ago