NinjaKit: GreaseMonkey for Safari! : apple - Link to Reddit because the original site is in Japanese. Greasemonkey provides a nice interface for user scripts to modify websites, can sometimes be quite helpful. For Firefox already a standard, for Safari rather unusual (although it is e.g. already integrated in Fluid, a WebKit-based browser).
Archive 13. September 2010
NodeBox for OpenGL | City in a Bottle - builds on Pyglet and provides a 2D animation library for Python.
objgraph - Drawing Python object reference graphs - I'll definitely check this out, even though I fear my memory structures are too wild to be represented graphically (many such tools assume that everything more complex is encapsulated in objects, but with a more functional programming approach, standard data structures are used much more heavily). It would be worth a try, though.
pyglet - interesting small graphics library for Python. Looks nice and is multi-platform and should be easy to install (no dependencies).