Looking for a Linux palette tool similar to Cyotek Color Palette Editor

Windows has a small tool for editing and optimizing color palettes, customizing them to your own needs, etc. I haven’t been able to find a comparable, useful tool for Linux. There are some programs that aren’t bad, but they don’t come close to this level of convenience. So, I’m asking around: does anyone know of a Linux program that comes close? – I don’t mean Wine-based solutions or anything like that, no.