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Free PHP Blog Scripts

WordPress
Part blogging tool with cms features based on PHP and MySQL. Supports themes, plugins, multi-user and multiple blogs

PivotX
Pivot is a web-based tool to help you maintain dynamic sites, like weblogs or online journals, including multiple weblogs with one installation. Uses the Smarty template engine and either a flat files database or a MySQL database.

b2
b2 is a news/weblog tool based on php and mysql, you can install b2 in an already existing database, and you can put several b2's in one database. Pages are generated dynamically from the MySQL database.

Serendipity
Serendipity is a weblog/blog system, implemented with PHP. It is standards compliant, feature rich and open source (BSD License).

Nucleus
With Nucleus, you can set up one or more weblogs. If you want to, you can even show the contents of multiple weblogs on the same page. You can set up a team of authors for each blog, with a separate login and different rights for each member.

b2evolution
b2evolution is a classy news/weblog tool (aka logware), allowing you to run newsfeeds and weblogs. b2evo runs on the very common PHP/mySQL platform.

bBlog
bBlog is a blogging system written in PHP and released under the GPL. bBlog uses smarty for templates, plugins, and as much as possable other parts of Smarty.

BLOG:CMS
BLOG:CMS includes state-of-the-art weblog, forum, wiki engine, news aggregator (atom / rss), and photo gallery. It ships with application/xhtml+xml MIME type by default, for top performance on modern browsers. It will also automatically supply older standard, text/html, to browsers which cannot handle this, like MSIE.

BMachine
BMachine doesn't require any database system such as MySQL or Postgres SQL, it works both on MySQL and flatfiles.

bplog
bplog is a minimal weblog/news script for use with Apache+PHP+MySQL