Hi lxuzyl !
And welcome to PokerStrategy.com !
Supporting 3rd Party software?
Hmmm....
Probably the most important would be a HUD
The two most common are Holdem Manager and PokerTracker.
Both have free trials.
Beside the HUD both of the above keep a database of all the hands you've played for session evaluation etc.
If you play Sit-and-go tournaments, then Sit N' Go Wizard might be worthwhile too.
PokerStrategy.com also offers several analysis tools that are extremely useful.
Check them all out here:
http://www.pokerstrategy.com/software/
Thanks for the Hug!
Since this is the "Introduce Yourself" forum, why not tell us a bit about yourself, what games you currently play, what your goal are and so on.
Great to have you on board!
--VS