As far as I know, the Gigabyte RGB Fusion and ASUS Aura Sync have the biggest number of RGB peripherals, ASUS has RGB Ram from GSkill, Aura Sync compatible keyboards, mice, headphones, RGB stripes and RGB fans, nut I do think the others may have. Try searching on their sites. I will let you the links for Aura and RGB Fusion
https://www.asus.com/campaign/aura/us/Sync.html
https://www.gigabyte.com/mb/rgb/
I hope I helped you!!