Guys, I can confirm that you can use Coinomi to claim your BTG.
As for BCH, I used TREZOR's own claiming engine. I believe TREZOR can do BTG too.
Whatever you do, be EXTRA careful. You're messing with the private keys that hold your BTC stash! Make sure you know what you are doing!
Correct, Trezor can do BCH and BTG. That's what I used. For BSV I used ElectrumSV (only days before it jumped to $250ish but hey, big deal) These are the only fork coins I've grabbed, anything else worth the trouble?