I've played around Plesbtr for a while and can undoubtedly say it's pretty neat. I tried our Amethyst too and that gives off another vibe, similar to Plesbtr.

Just like there are different digital wallets to access exchanges for the buying, selling and storing of cryptocurrencies, Nostr and pretty much any other decentralised system have a plethora of third party applications that grant access to the underlying core...