liste von jabber/xmpp servern
psyced, a scalable multi-protocol multi-casting chat, messaging and social server solution to build decentralized chat networks upon, released as open source.
chatten auf jeder website mit avatar, nur für windows
verschlüsselter chat per web, schickes erklärvideo
Cryptocat lets you instantly set up private conversations with some limitations. It's an open source encrypted alternative to other services. Messages are encrypted inside your own browser using AES-256. Encrypted data is securely wiped after one hour of inactivity.