Just Color Picker - Free portable colour picker and colour editor for web designers, photographers, graphic designers and digital artists. Supports Windows and macOS.
Pennywise - Cross-platform application to open any website or media in a floating window
Instant Eyedropper - Identifying the color code of an object on the screen is usually an involved, multistep process:...
PiP for Mac - Always on top window preview similar to the popular windows only OnTopReplica
gcolor2 - GTK+2 Color Selector
PiPer - A DIY Minecraft computer to build gadgets