OK, 'Poker helping software' is a rather generic term.
There are the trackers, PT4 and HM2 and perhaps some others. There is the PokerStars
school. I believe there are other training software's out there.
Before you spend any money you might try out Carbon Poker
, which has a free HUD/Tracker available for all players. It is not bad. It is also not available on any of the other Merge skins. It will give you an idea of what all the hubbub is about. It comes up in Omaha games, but doesn't really work for anything but holdem.