Which programming language do you prefer? In Java for example, CILib (http://www.cilib.net/) provides a lot of implementations for evolutionary algorithms. They may all be accessed through the same interface und thus be used for comparison on pre-defined test-funktions (the framework already provides a lot out of the box). Commons Math (http://commons.apache.org/proper/commons-math/index.html) also provides many implementations. The Watchmaker (http://watchmaker.uncommons.org/) is another framework, but I have no experience with that one.