Pierre Chatelier
LaTeXiT
FreeTypeset LaTeX equations and export them as PDF by drag & drop.
Mac
MozoDojo
FreePhoto-mosaic builder.
Mac
ASPPPPP
FreeMouse across your desktop the way Aperture Science can.
Mac
ShapeOnYou
Freecreate, animate vectorial shapes to illustrate docs
Mac
SickSaver
Freescreensaver that makes people feel sick
Mac