Raspberry PI, the nano-computer

The Raspberry Pi is a series of credit card-sized single-board computers developed in the UK by the Raspberry Pi Foundation.

Some capabilities:

• Parental Control:
  Used as DHCP and DNS server in the network, it can be configured to restrict Internet access according MAC addresses.
• Extended NAS
  In combination with a USB hard drive and the installation of a Web server and OwnCloud, you are not only able to access your files from anywhere, but you are in possession of a personal Clowd with similar features as Dropbox. You can give others access to a file or directory.
• Secure VPN Gateway:
  By installing openVPN, it allows secure VPN access and can even can join multiple private networks via the Internet. Using SSL / TLS with individual keys (2048 bytes), security is much higher as if you use the FritzBox VPN.
• PosBox:
  As a central module, it can connect the POS printer, the bar code reader, etc. to the network for points of sale with touchpads.

In principle, the Raspberry PI can support any server services if the necessary resources are moderate.