Looks like openSUSE has it in the repo: https://software.opensuse.org/package/OpenRGB
Should be able to install it easily from the command-line (my preferred method) using zypper. 🙂
Not in PopOS (at least, the version I’m on as the upgrade hasn’t landed yet) but Ubuntu has it: https://packages.ubuntu.com/questing/openrgb
Arch has it as well: https://archlinux.org/packages/extra/x86_64/openrgb/
