I would recommend to use WordPress. I use WordPress on this blog and it is the most popular blogging software online. It is also free blogging software.

WordPress started in 2003 with a single bit of code to enhance the typography of everyday writing and with fewer users than you can count on your fingers and toes. Since then it has grown to be the largest self-hosted blogging tool in the world, used on hundreds of thousands of sites and seen by tens of millions of people every day.

On WordPress website you can download and install a software script called WordPress. To do this you need a web host and a little time. WordPress is completely customizable and can be used for almost anything. All the details on how to install word press are here.

There are also others, like:

• b2evolution
• Drupal
• Livejournal
• LifeType
• Movable Type