UltraSurf is a free software which can be used to browse websites which are otherwise censored.  

The software uses advance encryption techniques which makes your surfing truly anonymous.  The advance proxy technology used by them hides your real IP address from everyone else and hence it can ideally be called an anti-censorship software.  

A Firefox addon is also available for this software. 

Using the software requires some knowledge of IP addressing, proxy settings etc.  The file is only 924 KB in size.  

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