Raddle - Question and answer forum
Jabjab.de is a free XMPP (formerly Jabber) service and a non -commercial, private project.
Black Hat Chat
The most secure and private web messenger in Tor.
Private, Anonymous & Bulletproof XMPP/Jabber Service
[RAMBLE] offers privacy-respecting user forums for informed discussion, and link and image sharing.
Tor-Based Chat For - The Privacy Cautious.
Pitch
NULL Message in one of the most secure and quick communicating platform in the Deepweb. All messages are self-destructed in 21 days
Hidden Answers, where you can ask questions and receive answers from other members of the community.