Palladium Books

Palladium Books is a company mostly ran and founded by Kevin Siembieda. It has produced around 15 separate settings all using a single semi-standardized game system. It is about on the same level of complexity as D&D 3.5, but may be harder to learn from the book because of layout (depending on the which book you use, some are weirder then others, opinions fa/tg/uys?).

The first books were The Palladium Fantasy RPG and Teenage Mutant Ninja Turtles & Other Strangeness, followed by the official Robotech role-playing game. Their most popular product to date is the Rifts RPG and setting.

Settings:

• After the Bomb
• Beyond the Supernatural (CoC esque)
• Chaos Earth (RIFTS as it descends into grimdark)
• Dead Reign (BRAAIIIINSSS)
• Heroes Unlimited (Supa Heroes)
• Palladium Fantasy RPG (the company's first)
• Nightbane (google high octane nightmare fuel)
• Ninjas and Superspies (... that was easy!)
• RIFTS (MOAR MEGADAMAGE)
• Robotech (yes the anime one)
• Robotech RPG Tactics
• Mechanoids
• Recon
• Splicers (Guyvers vs Skynet!)

As well as several others ("Teenage Mutant Ninja Turtles and other Weirdness!"), and a few non-setting specific series such as the weapon compendiums (made to be at least useful, if not easily adaptable to any system), and the quarterly released Rifter (a hodgepodge of material that never made it to the source books along with homebrews Kevin made cannon).