What's a good replacement for Google Apps in a NSA-poisoned post-cloud era? 13 years ago
This is a good guide for setting up self-hosted email: http://flurdy.com/docs/postfix/
Owncloud is ok for self-hosted file hosting. It's a little buggy still, but is improving very quickly. It also has Android and desktop apps.
Although Owncloud has contacts/calendar built in, Radicale is more polished and has more features. It's also easy to set up. Make sure you get the latest version through pip rather than your distros package manager.
On Android you can then use CardDav Sync / CalDav Sync to sync calendars and contacts.