Integrations with SABnzbd, Sonar, CouchPotato, etc.
Multiple APIs: Custom and Newznab
Forum access for all users
IRC channel on irc.servet.net: #omgwtfnzbs.support and #omgwtfnzbs (invite only)
As a free member of OmgWtfNZBs, you get a limited but decent amount of NZB grabs and API hits per day. Upgrade to a donator status and you get unlimited downloads and hits. Donating also allows the member to get a certain number of invites to give away.