Freenet
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Freenet
Freenet is free software which lets you anonymously share files, browse and publish "freesites" (web sites accessible only through Freenet) and chat on forums, without fear of censorship. Freenet is decentralised to make it less vulnerable to attack, and if used in "darknet" mode, where users only connect to their friends, is very difficult to detect.
Installation
First you need Java
Then click on this link http://checksums.freenetproject.org/latest/freenet.jnlp
Then the install process will be displayed.