a lot. for posting with custom emoji i use nostter by nostr:npub1s02jksmr6tgmcksf3hnmue7pyzlm0sxwarh7lk8tdeprw2hjg6ysp7fxtw https://nostter.vercel.app/

for creating and managing custom emoji this app i made https://emojis-iota.vercel.app/