The TOR Project has been the go-to group when it comes to anonymity. This group and their TOR browser bundle are used by millions of people daily and not just to surf for illegal items or porn. In many cases the use of TOR allows dissidents in countries with oppressive governments to maintain connections to the outside world and also communicate. In areas like China TOR and their obfuscator project allow free access to the internet despite the great firewall of China.