So I'm looking to run a Savage Worlds based Play-by-Post RPG on the forums.
Savage Worlds is a simple enough system to get into and I've been playing and running games of it on another site.
There is also this website where you can create characters;
https://savaged.us/Now for the options;
Deadlands - One of the system's flagship settings, originally Weird Western but has branched out into other genres; Noir, Post Apocalypse, SciFi and soon Dark Ages as well. The original Western based setting has recently had a Kickstarter for a new edition.
Mutant Chronicles - I call this '40K Lite'. Far future has seen the Earth abandoned and megacorporations spreading out across the solar system before dark forces were unleashed and pushed back.
Ravenloft - The classic Gothic Horror setting of D&D fame, has a quite nice fan conversion for Savage Worlds.
Weird Wars - Another flagship for Savage Worlds, Weird Wars combined the likes of WW2 with supernatural horror. Think Hellboy or that recent Overlord film.