Not graphene specific but nzb360 is a great paid app for managing your arr stack that isn't available on iOS & Well worth the price imo. Obtanium for GitHub apps, shizuku can do some cool stuff that would ordinarily require root, revanced manger for youtube if your still using Google or newpipe from fdroid if not. Use the aurora store to avoid Google play. Seeker is an android based soulseek client on fdroid for music. That's all I can think of for now.