Here is a collection of open source Operations Research (CP and LP falls under the umbrella of Operations Research) projects: http://www.coin-or.org/projects/ h

Here is a collection of open source Operations Research (CP and LP falls under the umbrella of Operations Research) projects: http://www.coin-or.org/projects/ http://www.coin-or.org/projects/ There are many fantastic open source libraries in there to handle many types of optimization or assignment.