monner(github.com) Ever get confused what application is bring your machine to grinding halt (Firefox on OSX most likely). Monner allows you to monitor network and memory usage; tab separated for easy export.
xkcd password generator(github.com) xkcd is funny. its even more fun with developers with a little time and tendency to take things a little seriously bring you things as awesome as this.
pytrace (github.com) Pytrace records function calls, arguments and return values to aid in debugging and profiling.
webkit2png (github.com) Oldie but a goodie. Taking full length browsershots hasn’t been easier with webkit2png.