Check out Holdem:

Holdem Manager is a multipurpose poker tracking software. In this day and age, online poker is a very vibrant and competitive arena and it is fundamental to use the poker tools that your competition may be using against you in order to play on an equal footing with them.

Holdem Manager is a comprehensive suite of statistical tools designed to answer the numerous questions that you have with respect to your own game or your opponents' game.

Do you limp too much with suited connectors in middle position? Is GoldenDonky a big bluffer? How often do players check-raise a preflop raiser at the flop? What is the list and the underlying statistics of the most aggressive regulars at no-limit holdem midstakes at Full Tilt Poker? These are the kinds of questions that Holdem Manager can easily answer, and many more.
Source(s):
http://www.learn2holdem.com/poker-software-reviews/holdem-manager-review.ht...

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Here is the code for four open-source poker rooms.

http://sourceforge.net/projects/pokerth/
http://code.google.com/p/pokerspot/source/checkout
http://freshmeat.net/projects/poker-network
http://code.google.com/p/cspoker/

The successful rooms are making far too much money to put their software up for sale. So any version you see for sale, I would say is not worth it, you should save that money and work off one of these open-source versions.
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