<P> Several software packages have been created to run prisoner's dilemma simulations and tournaments, some of which have available source code . </P> <Ul> <Li> The source code for the second tournament run by Robert Axelrod (written by Axelrod and many contributors in Fortran) is available online </Li> <Li> Prison, a library written in Java, last updated in 1998 </Li> <Li> Axelrod - Python, written in Python (programming language) </Li> <Li> play the Iterative Prisonerr's Dilemma in the browser, play against strategies or let strategies play against other strategies </Li> </Ul> <Li> The source code for the second tournament run by Robert Axelrod (written by Axelrod and many contributors in Fortran) is available online </Li> <Li> Prison, a library written in Java, last updated in 1998 </Li>

The principle of utility was used to evaluate the success of prisons