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http://b2evolution.net/
b2evolution is an open source PHP / MySQL blog platform. It seems to be more basic and less polished than the likes of WordPress, MovableType or Habari.
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http://blognetworkwatch.com/category/blog-network-list/
Haphazard list of blog networks from BlogNetworkWatch.com. Probably a useful site.
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http://en.wikipedia.org/wiki/Blog_software#Free.2FLibre.2FOpen-Source_software
A list of free / open source blogging platforms on Wikipedia. Handy. :)
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http://lifetype.net/
LifeType is a multi-user, multi-blog blogging platform. It started in 2003 and is up to date as at Mar 2008. Seems to support all the major features.
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http://mephistoblog.com/
Mephisto is a blogging platform, competitor to WordPress but on Ruby on Rails.
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http://pebble.sourceforge.net/
Pebble is a lightweight, open source, Java EE blogging tool. It's small, fast and feature-rich with unrivalled ease of installation and use. Blog content is stored as XML files on disk and served up dynamically, so there's no need to install a database.
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http://performancing.com/
A site about how to get more from your blog, drive revenue, etc.
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http://roller.apache.org/
Apache Roller is a full-featured, multi-user and group-blog server suitable for blog sites large and small. It powers internal and external employee blogs and Sun, IBM and other companies as well as the JRoller.com Java blogging community.
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http://twitter.com/home
Microblogging on mobile phones, IM, the web and more.
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http://www.amatomu.com/
Amatomu is a South African blog aggregator. Users register their blog with the site and then it tracks popularity, traffic, reach, etc. It's purely for South Africa.
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http://www.b5media.com/
b5media is a blog network company. As at Jan 2008 they have over 320 blogs in 15 channels and over 10m unique visitors a month. They user WordPress standalone for all their blogs and manage monetisation centrally.
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http://www.bloggersblog.com/blognetworklinks/
A list of almost 200 blog networks.
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http://www.blogrolling.com/
BlogRolling allows you to put one code block in your template and then manage your blogroll via their service. It also supports differentiating between frequently read sites and infrequently read sites.
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http://www.blojsom.com/
Blojsom is a java blog platform. Multi-blog, multi-user blogging platform. It powers Apple's Mac OS X Tiger Server Weblog Server.
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http://www.buzzbums.com/
BuzzBums is a blog directory. It costs $1 to join for a minimum of 25 years. They aggregate content and offer aggregated feeds for member blogs.
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http://www.dollarsblog.com/
DollarsBlog is a blog aimed at professional bloggers. Potential affiliate for wppro business.
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http://www.gelatocms.com/
gelato cms is described as a tumblelog cms. It's based around the tumbr concept, you can easily post snippets. Various themes and plugins are available.
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http://www.habariproject.org/en/
Habari is an open source PHP / MySQL blogging platform (like WordPress).
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http://www.pixelpost.org/
Open source photoblog software. Funky, clean, described as extensible. PHP / MySQL based.
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http://www.problogger.net/archives/category/blog-networks/
Posts in the blog networks category on ProBlogger.net (part of the b5media blog network).
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http://www.punchtab.com/
Really interesting service that builds an instant "loyalty program" which tracks users points for various actions on a web site, creates a league table, allows for paid out rewards, and so on. Very interesting.
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http://www.s9y.org/
Serendipity is a PHP / MySQL blogging system. It uses the Smarty template engine.
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http://www.weblogsinc.com/
Weblogs Inc is a blog network of professional bloggers. One of the biggest in the business. Similar to b5media.