Our XMPP services at DuckDuckGo
TL;DR: DuckDuckGo, a search-engine known for privacy, has a public XMPP service that promises the same level of privacy as their searches. They also have an XMPP chat-bot that will respond to queries over XMPP, but this is less interesting.I personally am a fan of DDG and use it as my primary search engine. I do wish they'd change their name as it makes it difficult to recommend to non-technical people.