A Raspberry PI NAS or network attached storage is a great way to have a shared drive that's accessible to everyone on the same network. You can limit access to the drive if you don't want certain people in your files.
Create your own cloud server on the Raspberry Pi 2
Installing openHAB on a Raspberry Pi
Raspberry Pi Home Automation
Raspberry Pi 2: 18 of the best projects you can try with the microcomputer | 2 | Alphr
Raspberry Pi B+: setting up a home server with just a USB Harddrive - Full Selection of Pi Products: http://www.mcmelectronics.com/content/en-US/raspberry-pi