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The Open Web Application Security Project (OWASP) is dedicated to finding and fighting the causes of insecure software. Everything here is free and open source. The OWASP Foundation is a …

FreeNX is based on NoMachine.com NX compression GPL components to allow a fast, graphical remote desktop terminal session for UNIX-based systems. NX uses SSH tunneling to perform authentication and link …

Some are pdf files and you can download them.  Most of them in  spanish. Link

Revolution OS, The code: linux, links to youtube or direct download.

One tutorial

A lot of them here