Social Source Commons

An entry-level, hosted blogging option that is owned by Google.

Very extensible CMS platform based on PHP and used by many NGOs - "Community Plumbing"

A powerful platform for content, community and collaboration websites

Joomla is an award-winning content management system (CMS), which enables you to build Web sites and powerful online applications. Many aspects, including its ease-of-use and extensibility, have made Joomla the most popular Web site software available. Best of all, Joomla is an open source solution that is freely available to everyone.

Web based RSS aggregator and blog reader

A free, flexible, elegant, easy-to-use content management system for all kinds of websites, even weblogs.

Livejournal / Blogger / Wordpress Client for Firefox.

WhatCounts is an email marketing firm - providing cutting-edge publishing technology through ASP, Appliance, Managed Enterprise, and Agency solutions.

Tag search optimizer

ExpressionEngine is a highly flexible, feature-rich web publishing system that empowers individuals, organizations, and companies around the world to create dynamic, content-driven websites

Minimalist posting client for del.icio.us.

Personal Information Manager

Blog creation software

Social networking for readers of blogs

Widgetbox is a directory and syndication platform for web widgets for blogs and other web pages. Widgets work with TypePad, WordPress, Blogger, MySpace as well as most other blogs, sidebars or websites. No plug-ins are needed, and widgets are free

blogging tool

Opensource web publishing platform.

Blog platform software.

e107 is a CMS written in PHP and using the popular open source MySQL database system for content storage. It's completely free, totally customisable and in constant development.

Pligg is a PHP/MySQL CMS with a Web 2.0 feature set allowing users to easily create digg-type websites with an integrated user voting system.

Blogging support and management software. Allows posting from desktop, workflow automation, includes support for WordPress, Blogger, Typepad, Typo, Drupal and others.

Seesmic is a video micro blogging web application to make video uploading easier for those using webcams.

A PDA friendly interface for your blog.

See How Your Competitors Blogs Traffic Compares

An application that aims to evolve existing functionality of Twitter by breaking down Twitter feeds into more manageable bite sized pieces. Track Twitter feeds and social media activity.

BlogBackupr is a free, hosted tool for backing up your blog content including posts and media. It supports any blog platform that uses an RSS feed and also has the option of auto-restore.

Plurk is an alternate blogging platform, describing itself as "a social journal for your life." which enables users to share their life easily with friends, family and fans.

Upload and share videos on any WordPress blog or any site, with full HD support.