HEATKEYS

CentOS -- Community ENTerprise Operating System is a free rebuild of source packages freely available from a Prominent North American Enterprise Linux vendor.

Oracle Documentation

The Linux Documentation Project is working towards developing free, high quality documentation for the Linux operating system. The overall goal of the LDP is to collaborate in all of the issues of Linux documentation.

Linux.com - For the community, by the community, Linux.com is the central source for Linux information, software, documentation, how-tos and answers across the server, desktop/netbook, mobile, and embedded areas.

Over two thousand step-by-step tutorials covering all tech topics.

Novell is a leading provider of infrastructure software. Our vision is helping people and technology to work as one. Our mission is to help customers reduce the cost, complexity and risk of computing on any platform.

Free tutorials and reference manuals with examples for HTML5, iBATIS, Django, JSP, JAVA, JDBC, AJAX, WAP, SQL, MySQL, C/C++, PERL, PHP, Ruby, Ruby on Rails, Python, HTML, XHTML, CSS, CGI, Shell, Unix, JavaScript, jQuery, Radius, UML, GPRS, GSM,i-Mode...

A repository for the most elegant and useful UNIX commands. Great commands can be shared, discussed and voted on to provide a comprehensive resource for working from the command-line

Programming tutorials and source code examples