CIE color difference formulas in JavaScript
Initial S-CIELAB Implementation (Zhang and Wandell)
RGB, XYZ, CIELab, and CIELCh color space conversions in Swift
A header-only C++11 library for colors; color space converters for RGB, HSL, XYZ, Lab, etc. and perceptual color difference calculators such as CIEDE2000
RGB to XYZ Converter + RGB/XYZ to CIELAB Converter + Delta-E Calculator - Implemented in C++
Color conversions RGB->XYZ->CIELab->XYZ->RGB
Color conversion & manipulation library by the editors of the CSS Color specifications