I recommend anything that is open source, please donate!
Lightroom over Aperture
Photoshop over anything
Illustrator over Corel Draw
Indesign over Quirk Express
other little goodies are:
1password
A better finder re-namer
istat menus
Transmit (FTP)
and anything that adds good functions to productivity and workflow such as free presets, and software plugins and scripts (nothing better than getting photoshop to run an action and save in 2 other formats at 2 sizes and 2 colour profiles, on 2000 images - all by it's self!!!