Tellico
Tellico is a free and open source software for organizing various collections
GCstar
GCstar is a free open source multi-platform software for managing your collections
Colorpicker
Colorpicker a free and open source cross platform desktop software for determining the color on the screen
ColorPicker App
ColorPicker App – screen color picker application for Linux Desktop
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
Buka
Buka is a book manager with a simple and minimalistic user interface for organizing and reading PDF books
csBooks
csBooks – manager and reader of eBooks in PDF, EPUB and MOBI formats