Tom77611 Popular theme, there's a lot of equipment, that RHCP use. If you're interested in equipment, you can check it here http://equipboard.com/pros/john-frusciante/#effects-pedals , so as you see it's highly vary.
You can also check some forum threads, using forum search (like this one https://www.ultimate-guitar.com/forum/showthread.php?t=752236 ), or you can specify, what songs or albums you're interested in.