Pen and Paper - Wizards of the coast is your best bet. Playing with friends and possibly your local comic book shop to get word of mouth and suggestions on bettering the system. Electronic - There are websites that you can post them. Such as the one for RPG maker. (That one may ask you use their system.
The Metabarons Roleplaying Game happened in 2001.
Pathfinder Roleplaying Game happened in 2009-08.
Marvel Universe Roleplaying Game happened in 2003.
DC Universe Roleplaying Game happened in 1999.
The Lord of the Rings Roleplaying Game happened in 2002.
Amber Diceless Roleplaying Game happened in 1991.
Star Trek Roleplaying Game - Decipher - happened in 2002.
Star Wars Roleplaying Game - Wizards of the Coast - happened on 2007-06-05.
Roleplaying in the game World of Warcraft
I have played WOW for a long time. I think it is a perfect roleplaying game which make us feel satisfy.
Infamous definitly.
Grendel's Revenge