Just Color Picker - Free portable colour picker and colour editor for web designers, photographers, graphic designers and digital artists. Supports Windows and macOS.
Encycolorpedia - Providing hex color schemes, paint matching & search, color directory and color space conversions.
Sip - A better way to collect, organize & share your colors.
HTML CSS Color Picker - HTML CSS Color Picker is an online website that provides you an extravagant color scheme that can be shared anywhere else.
ColorSnapper - The missing color picker for Mac.
BeautyColorCode - BeautyColorCode is a reliable platform for getting your colors right, courtesy of the extensive color scheme library that is easy to share and download.