NFC Yourls Library turns a self-hosted Yourls site into a tappable catalog. Scan a book's barcode to look up its title, author, and cover, create a short link on your own Yourls server, and write it to an NFC tag in seconds. Anyone who taps the tag with their phone opens the link. Manage multiple Yourls sites, lock tags with a hardware password so they can't be overwritten, and keep everything on servers you control. Your tokens stay in the device Keychain and nothing is sent anywhere except your own site.
See the wiki for more information.