Clusterfit
Show stellar evolution and open clusters in a color-magnitude diagram
...In addition, it can show the CMD of a large number of existing open clusters, based on scientific survey data, and overlay isochrones (the curve in a CMD from stars born at the same time) to determine the age, distance and interstellar reddening of the cluster. Determining these parameters can be done automatically with a global search
algorithm (more specifically a genetic algorithm).
This program requires the installation of the libfgen package, also available on SourceForge.