When I first created PHPLOT I started with CVS. When I moved it to Sourceforge I converted to SVN. Now I'm using git and this guide is how to migrate from Sourceforge to Github or, in general, any SVN to git repository. 

1. Create the list of SVN Authors

Subversion only keeps the username for each commit. Git’s commits need to have a name and email listed at a minimum. By default git-svn  will just list the SVN username. This list can be used by git-svn to transform plain svn usernames into proper Git committers.