Nomen is an open protocol for global names, like a decentralized DNS, built with Bitcoin and Nostr. The goals of the Nomen protocol are decentralization and self-sovereignty.
Nomen Explorer is an indexer. It catalogues the Bitcoin blockchain and associated Nomen events on Nostr.
Check out some more information below, starting with the FAQ if you want details. Check out the Explorer if you want to see what names already exist out there.