OldUnreal (Engine)

If anyone is in trouble using this hardware in Linux while having no support for it from Corsair, take a look here:
https://github.com/ckb-next

They already support quite some features so that you can set up additional buttons, RGB lights, DPI settings (including  independent  XY) and additional stuff like angle snapping, lift height and report rate setting (whatever your hardware supports of course).
Basically everything the Corsair software does. A lot of stuff is still in development and you shouldn't expect every feature for every piece of equipment, but they try to help in every way possible, so they are working out right now support for my M95 mouse

Right now the official supported hardware list is:

Keyboards

    K55*
    K63 (wired only version)
    K65:
        RGB
        non-RGB
        LUX RGB
        RGB RAPIDFIRE
    K66
    K68:
        RGB
        non-RGB
    K70:
        RGB
        non-RGB
        LUX RGB
        LUX non-RGB
        RGB RAPIDFIRE
        RAPIDFIRE non-RGB
        RGB MK.2*
        RGB MK.2 SE*
        RGB MK.2 LP*
    K95:
        RGB
        non-RGB*
        Platinum*
    Strafe:
        RGB
        non-RGB
        RGB MK.2*

Mice

    M65:
        non-RGB
        PRO RGB
    Sabre:
        Optical RGB
        Laser RGB
    Scimitar:
        RGB
        PRO RGB*
    Harpoon
    Glaive*
    Katar

* = hardware playback not supported. Settings will be saved to software only.