OperaTor is a software bundle that can be easily installed on a portable memory (pendrive, USB stick, hard drive) to enable anonymous browsing while using a computer at an internet café, library, etc.
It combines the power of the Opera Browser (version 9.02), The Onion Router (version 0.1.1.23), and Privoxy.
With OperaTor, no data will be stored on the computer into which you plug your portable memory.