TUN is for IP tunneling. TAP is for Ethernet tunneling. Check out vtun if you’re looking to get networking working in qemu or kvm for virtual tunnels over tcp/ip networks with traffic shaping, compression, and encryption. vtun also supports serial and pipe tunnels.

Perpetual Data is a peer-to-peer application that allows you to use an arbitrary computer as your own, with access to your personal and public data for the duration of your login. When you log out of the application, access to you data disappears from that PC.