Farcaster is a truly open platform. It's hard to understand how open, without going into a long technical (and in some ways philosophical) discussion. But a good way to get a feeling about this openness is taking a look at what's been built on it and how it's used.

So here are some of my favorite Farcaster-related links.

casthose.xyz: a nice little tool that shows every new cast in real time.

Fresh blood: a sub-page of marble, showing new user signups. (marble allows users to do a "cast-storm")

vasco.wtf: Gives you an x-ray view of any cast (the "source" of the cast). Just replace the warpcast.com part of a cast on warpcast with vasco.wtf. (I also created a bookmarklet which does this automatically and I use quite often.

fardrop.xyz: Enter a farcaster username and get a list (of a merkle tree) of the addresses of its followers. Ideal if you want to airdrop or create an allow list using the Farcaster social graph.

farcasteruserstats.com: Stats for any user. Here is my page.

later.wtf: Schedule a cast to be posted in the future.

searchcaster.xyz: A search engine for Farcaster.

Farcaster dune dashboards by @pixelhack and @gabrielayuso.eth

buidler.app: A web annotation tool that enables users to collaboratively annotate and discuss any webpage. One of the most exciting features of Farcaster.

farcord.com A Discord-like interface for Farcaster.

gift.fcstr.xyz lets you give the gift of Farcaster to a friend (you can pay for their signup).

If you are worried about your available Farcaster storage, cast @fc1 storage and a bot will respond with your storage usage and limits. Of visit caststorage.com to check and buy additional storage if needed.

Also, make sure you subscribe to outcasters.xyz, a (beautiful!) weekly curation of what happens on Farcaster.

Of course you can always take a look at https://www.farcaster.xyz/apps that lists a growing number of apps built on Farcaster.