ZoomIt - Presentation utility for zooming and drawing on the screen.
gpick - A color picker and color scheme creation tool.
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.
gcolor2 - GTK+2 Color Selector
Zoomtext - ZoomText Magnifier enlarges and enhances everything on your computer screen, making all of your...
Just Color Picker - Free portable colour picker and colour editor for web designers, photographers, graphic designers and digital artists. Supports Windows and macOS.