What's a good replacement for Google Apps in a NSA-poisoned post-cloud era?

These days, anyone who values their privacy are probably considering migrating away from US-based cloud-services... In an age of NSA masss-surveilance and service-providers getting hit with secret requests for information, it seems the only thing you can actually trust is open-source software you host yourself.<p>Does anyone have a good guide or experience moving from cloud-services like Google apps to a completely self-hosted open-source solution for email, contact-management and calendering? What about productivity tools?<p>Can you make all of this (more or less) seamlessly integrate with mobile-platforms?