Blacktree
Quicksilver
FreeAccess applications and personal data by typing abbreviations.
Mac
Nocturne
FreeChange your display colors in ways more suited to low light conditions (such as at night).
Mac
Chime
FreeListen to an hourly chime marking the passage of time.
iOS
iTunes-LAME Encoder
Freeconvert cd & aac to mp3 with lame
Mac
Secrets
FreeTweak hidden prefs in Apple and third-party apps.
Mac