Virtual Magnifying Glass - Virtual Magnifying Glass, a free, open source, screen magnification program for Windows, Linux, FreeBSD and Mac OS X. Free full version download and instructions for use.

PiP for Mac - Always on top window preview similar to the popular windows only OnTopReplica

Magnifixer - Magnifixer is a screen magnifier utility.

Helium - Helium lets you accept payments by credit card for anything you want to sell online.

ZoomIt - Presentation utility for zooming and drawing on the screen.

X-Mouse Button Control - XMouse Button Control (XMBC) allows you to create application and window specific profiles.