drunkenslug.com - Usenet indexer providing SSL and integration for Couch Potato, Sonarr, Sabnzd and more.
NZBGet - The most efficient usenet downloader.
NZBgeek - A Usenet newsgroups NZB Indexer.
NZBGet.com - Fast, reliable, and feature-packed NZB downloader.
NZBHydra2 - NZBHydra2 is a meta search for NZB indexers.
SABnzbd - SABnzbd is a free/open-source cross-platform binary newsreader written in Python.