by Blacksun Software ColorMania is a extended colorpicker with an eyedropper component and a screen Magnifier. ColorMania lets you easyly select and modify colors. It's the ideal tool for website and application developers. The latest version has undo/redo functionality.
by Jay Prall Color Cop is a multi-purpose color picker for web designers and
programmers. It features an eyedropper, magnifier, variable magnification
levels, 3 by 3 and 5 by 5 average sampling, snap to websafe, color history,
and more. Multiple hex outputs.