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b2evolution is probably the most comprehensive blog engine you can find! It includes almost any feature you could expect from a blog tool, and more! Plus, it's free, it's open-source (GPL), it runs virtually anywhere (PHP/mySQL) and it's available in many languages!
You will find complete information on the official b2evolution website.
You can set up b2evolution in just a few minutes. Just follow the instructions matching your situation: