Users interested in Ultrasurf 13.1 generally download:
Ultrasurf lets you bypass Internet censorship in your college or company network. It uses end-to-end encryption to protect your data transfer from being seen by third parties. The program can be run directly from a USB drive - you need not install any application on your (or your company's) computer.
UltraSurf is a hard one to block at ISP level because it uses a peer-to-peer technology and several obfuscation techniques, making it challenging for network operators to identify associated traffic. UltraSurf encrypts data transmitted over the Internet between peers and is particularly gifted when it comes to circumvent security limitations.
UltraSurf is a free software which enables users inside countries with heavy Internet censorship to visit any public web sites in the world safely and freely. Users in countries without internet censorship also use it to protect their internet privacy and security.