// no ownCloud, please. My experiences with it are beyond bad, latest updates hosed systems world wide, it's feature-rich but beyond repairable.
The goal is to self-host some simple solutions on one of my Raspberry Pis, mostly to get rid of others willingness to support their stuff and for some added security, hopefully. Everything in question should come out of portage or has a working and recent ebuild somewhere.
Only the family needs to have access, all PCs are running some kind of Linux (Gentoo & Fedora), plus my notebook which in addition to Gentoo sometimes boots up OS X. Mobile devices are all Android (4.1.x or higher), all rooted and with custom ROMs.
I need solutions for contacts, calendars and task management(f.e. shopping lists). There need to be clients for Android available, ideally integrated into the system so the default calendar/contact apps can make use of it. Sharing of calendars needs to support read-only for specific accounts. Initial importing of data via .ics or .vcf files would be superb, but I'm willing to spend an evening doing it myself if needed. Simple exports in a human readable or well supported format are a must.
File transfering/syncing would be a nice addon, but simple SFTP is acceptable.
So, what software can you recommend, keeping in mind that the RPy isn't the strongest device?


