tox

http://testrun.org/tox/latest/
generic virtualenv management and test command line tool.

used by coverage.py, looks pretty interesting for testing against multiple versions and environments.

scm-latexdiff

http://www.numbertheory.nl/2012/02/09/scm-latexdiff-a-python-script-to-calculate-diffs-for-tex-files-in-git-or-mercurial-repositories/

works for git and hg repositories.

inspect-shell

https://github.com/amoffat/Inspect-Shell

looks like a pretty cool way to open a manhole into a running python script. it is not a debugger and it doesn't lock or interrupt. allows you to call functions, inspect or (dangerously) modify globals, etc.

gitflow

http://nvie.com/posts/a-successful-git-branching-model/
procedure for working with a sane graph of git branches, from Vincent Driessen

more info and tools from
https://github.com/nvie/gitflow

gource

http://code.google.com/p/gource/

version control visualization. makes really cool movies showing the people making revisions over time.