Wizards of the Coast bought out TSR (who first published Dungeons and Dragons back in the 1970s) and was in turn bought out by Hasbro.

They still publish Dungeons and Dragons, now in its third edition, and have added a few other RPGs as well.

Alternity is a science fiction adventure game.

Call of Cthulhu is a horror adventure game set in the world of H.P. Lovecraft, formerly (?) published by Chaosium.

Dungeons and Dragons is the game that started it all... now in its third edition and under its third (if you count Hasbro) publisher.

Marvel Super Heroes is a super hero RPG set in the world of Marvel Comics.

Star Wars is based on the worlds made popular by the movies by the same title.

The Wheel of Time is based in Robert Jordan's Wheel of Time setting.