newsgroups-indexer

NZBIndex is a Usenet indexer with a fast, full-featured search letting you narrow down searches by newsgroups, content age and size and much more.

Nzbplanet is a usenet indexer providing easy search and access to the latest NZB files for movies, games and much more.

Spotnet is a usenet client that utilizes a peer-to-peer indexing method where users "spot" content on usenet, notifying other clients that the content is there and available.

Spotweb is a decentralized usenet community based on the Spotnet protocol.