Software: Poker Hand Analyser.

One of the easiest aspect for the beginning player to improve is their understanding of the math and odds behind the game. One of the most interesting and informative aspects of televised poker is always the win percentages that are displayed. DaVinci's Hand Analyzer is a free application which lets you compare any two Texas Hold'Em hands at any stage of play (pre-flop, post-flop, turn, river). You can produce graphs of win/tie percentage, analyze percentages for various hands made (e.g. flushes), etc.
Helpfull tool for both the novice and the more savvy poker players.
www.pokerdavinci.com/