WordPress is a free powerful publishing platform, and it comes with a great set of features designed to make your experience as a publisher on the Internet as easy, pleasant and appealing as possible.
The documentation site for Wordpress (the Codex) is massive with hundreds of pages devoted to the overall project features, screenshots, how to contribute. The codex also includes entire sections for basic and advanced users to get a feel for using Wordpress and get their hands dirty on the internals. From getting started, to http://codex.wordpress.org/Working_with_WordPress, design and layout, advanced topics, developer documentation and troubleshooting the Wordpress Codex has you covered.
It covers versions all the way back to 1.2 (current as of this writing is 2.2) with changelogs of each version, many of which include diffs of the changed files.
Link: http://codex.wordpress.org/Main_Page
“WordPress was born out of a desire for an elegant, well-architectured personal publishing system built on PHP and MySQL and licensed under the GPL. It is the official successor of b2/cafelog. WordPress is fresh software, but its roots and development go back to 2001. It is a mature and stable product. We hope by focusing on web standards and user experience we can create a tool different from anything else out there.”
WordPress About Page
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