officialpokerrankings.com
From their FAQ
Q:
What kind of Full Tilt Poker tournaments do you track? A: We track
full tilt poker MTT's and SNG MTT with at least 18 players. (Exceptions are free rolls, private tournaments and other poker tournaments with buy-in restrictions)
Q:
What kind of PokerStars tournaments do you track? A: We track
pokerstars MTT's and SNG MTT with at least 36 players. (Exceptions are free rolls, private tournaments and other poker tournaments with buy-in restrictions)
Q:
What kind of Ongame tournaments do you track? A: We track Ongame scheduled MTT's. (Except free rolls and poker tournaments with special buy-in restrictions)
Q:
What kind of Party Poker tournaments do you track? A: We track
party poker scheduled MTT's. (Except free rolls and poker tournaments with special buy-in restrictions)
Q:
Do you track free rolls and tournaments with special buy-in restrictions? A: No, normally not - with a few exceptions.
Q:
Do you track satellite tournaments? A: We track PokerStars, Ongame and Full Tilt Poker satellites