reposurgeon 1.2 is shipped.
This is the repository editor I wrote about back in 2010; description here, architectural lessons here.
I did a conversion of the repo for the Roundup issue tracker, which had a messy history. It started out as CVS, got up-converted to Subversion, and I grabbed it with git-svn. Cleaning up the geological strata of conversion artifacts taught me some useful things.
Accordingly, a main feature in this release is a command that finds and removes zero-content commits created by cvs2svn->git-svn conversions. Also, the repository merge operation is no longer confused by out-of-order commits.