I would like to develop a poker odds application that can give the probability of various game situations. Since the application will be mostly statistical analysis, I figured I would see if someone else had already written a library that implements the required mathematics.
I would prefer cross-platform open-source in C++, but that's not a requirement.
This is a subset of Dave's list, but I suggest you look at twodimes.net. It is a web app that uses the pokenum open source library. It is written in C. It does hand enumeration and stats for several poker varieties.
Complete source code for Texas hold'em poker game evaluator can be found here:
http://www.advancedmcode.org/poker-predictor.html
It is built for matlab, the GUI id m-coded but the computational engine is c++.
It allows for odds and probability calculation. It can deal, on my 2.4Ghz laptop, with a 100000 10 players game computation in 0,3 seconds.
An accurate real time computer:-)