's e-mail client
5 (still in beta
as of this writing), which uses something like censorware
you about potentially offensive
Potential for offense is rated on a scale of 1 to 3 hot peppers, where fighting words are usually one pepper and nuclear words like cunt earn three peppers.
MoodWatcher doesn't actually prevent you from saying such things, so it's not really censorware. It just pops up a warning dialog box to give you a chance to reconsider.