jwaBlogger is social links/blogging software, that can easily be added to your website. jwaBlogger provides full HTML support, RSS and Atom feeds, a most popular blog entry history, and more. Example at: http://www.jwablogger.org.
Pligg CMS is a content management platform that powers tens of thousands of websites. It specializes in creating social publishing networks, where users submit and promote content similar to sites like Digg, Reddit, and Mixx.
A CMS that runs on top of Google App Engine
Jerba is a CMS to run on top of the Google App Engine. Set up a blog or a corporate website with this software in no time and with all the reliability and scalability of the elastic services from the big brother Google.
A blog with extended social features for school clubs and in-school programs (such as International Baccalaureate).
FrequencyCMS is a a light-weight, free and open source CMS.
FrequencyCMS is a a light-weight, free and open source content management system (CMS in short) which enables you to create websites, portals, blogs and "mini" social networks. It is written and developed by Đorđe Jocić and released under the GNU Affero General Public Licence.
Communication tool for technology enthusaists
Pythonica is powerfull microblogging platform written in Python. It provides functionality similar to sites like twitter.com or identi.ca. There are a number of sites that already intend to use Pythonica: blottle.com, ni4at.ru, nophp.ru and others.
A microblogging application
This is a service to make it easier for users to post content to Yahoo! Meme. It does that by generating a bookmarklet which users can click to post what they are viewing at the moment. This project uses the simpleyql library and runs on AppEngine.
x7Video is a free and open source Wordpress plugin created for KalturaCE v3.0.0 server administrators to easily incorporate many advanced online video features into their Wordpress blogs.
Is a PHP site to create a multi-user fotoblog.
WordPress theme for Magazine sites in Hebrew, with featured content, thumbnails and more. Initially developed for shakoof.org.il, a non-commercial news site.
WordBash is a WordPress clone written in GNU Bash
DEVELOPMENT IS ON HOLD WordBash is a Bash CGI script that looks and acts just like WordPress with many of the basic WordPress features - posts, pages, sidebar, comments, tags, categories, etc. WordBash is a 1300 lines of shell script. It only uses one call to an external program in a limited way - everything else, viewing, saving/filtering comments, etc. is done with just Bash code - No AWK, TR, etc. It's all Bash. WordBash is nearly identical to WordPress with the twenty eleven theme. WordBash has Object Oriented aspects, a Hierarchical File Database, Caching Factory based Web Templates and an Adaptive Extensible Record format. It does not have all WordPress features but it has most of the basics. It looks and feels just like WordPress of 20MB of code! But WordBash is 1300 lines of shell script. More work needs to be done - and I have not released the Admin code (but I will). The design has some flaws but they are easily fixed. The code is "designed for change."