Just Color Picker - Free portable colour picker and colour editor for web designers, photographers, graphic designers and digital artists. Supports Windows and macOS.
Ralpha Image Resizer - High-speed image batch conversion tool
Instant Eyedropper - Identifying the color code of an object on the screen is usually an involved, multistep process:...
ImBatch - ImBatch is a batch image processor with a nice graphical user interface.
gcolor2 - GTK+2 Color Selector
Caesium Image Compressor - Compress your pictures up to 90% without visible quality loss.