Usenet - Usenet is a worldwide distributed discussion system available on computers.
Usenet newsgroup - A Usenet newsgroup is a repository usually within the Usenet system, for messages posted from many users in different locations using the Internet.
r/Usenet - A thriving community dedicated to helping users old and new understand and use Usenet.
NZBLINK - The NZBLNK™ URI scheme defines the format of NZBLNK™ links to identify binary Usenet content and supplies some extra information to handle that content correct (similar to magnet links, but for NZBs).
Usenet-Uploaders - Table of applications for uploading content to Usenet.
QuickPar - Tool for reconstructing damaged/missing/corrupt Usenet binaries.
Usenet Express - UsenetExpress is a powerful new tier-1 Usenet provider that offers strong security, a 10GB uplink per server and up to 150 streams for an excellent price.
Binsearch - With this site you can search and browse binary Usenet newsgroups.
FindNZB - One old indixer, the results are outdated and often offline.
NZBIndex - The first free Usenet indexer you find in your Google search results.
NZBFriends - One of the oldest indexers, sadly the results are often outdated too.
NZBKing - The service allows you to search and browse binary files that have been posted to Usenet newsgroups.
Usenet Crawler - Usenet indexer with API access for registered users.
NewzLeech - Newzleech is a Usenet file search engine.
GingaDADDY - Another popular free NZB indexer, requires sign-up.
Indexing Software
Momentum Plus - Usenet-Newsreader and in the (near future) - indexer and collector for usenet files.
nZEDb-deploy - A collection of scripts to automate and simplify the deployment of a nZEDb Usenet Indexer using the new format of their GitHub repository.
nZEDb - A fork of nnplus(2011) - | NNTP / Usenet / Newsgroup indexer.