list of official web site of some of famous and major open source blog scripts(free)
http://wheatblog.sourceforge.net/
http://www.boastology.com/
http://www.b2evolution.net/
http://www.wordpress.org/
http://www.wikyblog.com/
http://www.dotclear.net/
http://www.lifetype.net/
http://sblog.se/
best regards
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