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g810-led
Linux led controller for Logitech G213, G410, G413, G512, G513, G610, G810, g815, G910 and GPRO Keyboards
If you want to control the RGB values, look at g810. It works pretty well with my Logitech keyboard.
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
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I use ckb-next as an open-source option for my Corsair K70 RGB (with cherry brown) on linux, and it "supports much of the same functionality, including full RGB animations".
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Various Roccat keyboards have fan-made linux drivers - the current gen 'Vulkan' drivers are here: https://github.com/X3n0m0rph59/eruption
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.