sK1 Color Picker
sK1 Color Picker – advanced color picker application with magnify glass and palette management functionality
Gpick
Gpick is an free and open source advanced color picker and palette editing tool for Linux
Pick
Pick – a software for picking colors on the screen in Linux
Gcolor3
Gcolor3 – free open source software for color choosing (on-screen color detection) and color selection in Linux
Qimgv
Qimgv – free and open source fast, configurable, easy to use image viewer with optional video support for Linux and Windows
Rapid Photo Downloader
Rapid Photo Downloader is a free and open source software for downloading photos and videos for the Linux Desktop
RawTherapee
RawTherapee is a free and open source, cross-platform raw image processing program
Darktable
Darktable – free and open source cross-platform software for processing and cataloging RAW images
XnConvert
XnConvert is a fast, powerful and free cross-platform batch image converter, It allows to automate editing for your photos
PhotoQt
PhotoQt is a free and open source multiplatform, fast and simple, yet powerful and highly configurable image viewer