WordPress is a blog publishing system written in PHP and backed by a Mysql database.
WordPress 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.
It is an Open Source project, which means there are hundreds of people all over the world working on it.
bBlog is a powerful, elegant personal publishing system running PHP/Mysql. It is a flexible but simple way to blog that works for blogging beginners, and can grow into a more advanced user's needs.
bBlog is used by thousands of bloggers world wide and has not only the features you would expect from a modern blogging system, but also advanced capabilities including advanced comment spam prevention and threaded comments. Perhaps bBlog's most distinctive feature is that it is built around a templating system called Smarty, which makes customizing your blog as easy as editing any web page, no programming skills required.
Subtext is working on ASP.Net/MS SQL Server platform
Subtext is a personal blog publishing platform that focuses on usability, elegance, and simplicity. If you’ve ever caught yourself throwing your hands in the air and declaring that you’re going to write your own blogging engine, then Subtext is for you.