BlazeBlogger is a simple-to-use but capable CMS for the command line. It produces static content without the need of database servers or server side scripting. It is suitable for a wide variety of Web presentations, from a personal weblog to a project page or even a company presentation.
The KiWi core system is a flexible platform for building different kinds of semantic social software applications on top (currently the Semantic Wiki and the TagIT application). It provides all the core services required in such applications, like editing and tagging, the storage of content and associated meta-data, its own triple store, transactions and versioning over content and meta-data, a linked open data server, and many small features semantic social software developers will like (like convenience services for working with ontologies or SKOS thesauruses, etc.).
OpenInviter is a script to import contacts (address book data) from email providers like Yandex, Lycos, Rambler.ru, Live / Hotmail, OperaMail, GMX.net, Mail.ru, Mail.com, GMail, Yahoo!, Rediff, AOL, and KataMail. It can import from content management systems like SimpleMachines Forum (SMF), Drupal, Social Engine, Wordpress, PunBB, Joomla, JamRoom, and PhpBB. It also imports from social portals like Twitter, Facebook, Hi5, Friendster, Orkut, Myspace, and LinkedIn. It offers basic "tell a friend" features.
folder2blog is a minimalist blog engine based on plain text. You maintain a folder of text files, one for each article, and folder2blog dynamically maps it to blog-ish HTML/RSS2 output. Comments are appended to each text file. Managing articles/comments now becomes creating or editing text files. For example, all you do is edit a local folder of plain text files and sync it with the server, manually or using tools such as rsync, over SSH or FTP. The encoding may be anything (UTF-8 by default). The HTML formatter is any external program, such as markdown, that may act as a pipe. The owner receives notification email for each comment. There is basic spam protection.
ContentRoller is an easy-to-configure, set up, customize, and use news, links, and blogging CMS environment that provides you the ability to have your own social news site like Digg, Yahoo Buzz, DZone, The Server Side, InfoQ, Slashdot, etc. ContentRoller can also be configured to look like a newspaper-based news site.
StatusNet is a microblogging platform. A StatusNet site is a lightweight social network that helps a community, company, or group to exchange short messages, files, and data over the Web. Users can choose which people to "follow" and receive only their friends' or colleagues' status messages. It provides a service that is similar to Twitter, Yammer, SocialCast, or Salesforce.com Chatter.
Voisin is a social networking and group collaboration platform. It's a complete Enterprise 2.0 solution that combines all of the technologies you need to implement Enterprise 2.0 best practices in order to help your work force realize the full benefit of social collaboration and knowledge sharing as they work to achieve group goals. It is based on the OpenEdit Framework.
Movable Type is a powerful, multi-user blogging platform. It's widely used as a business blogging tool thanks to the ease with which you can create multiple blog sites. It has a large community and many add-ons available. It's written in Perl and tends to be a bit difficult to install, unless of course you use the JumpBox. This JumpBox provides a basic installation of Movable Type setup with a single blog on the root URL of the system. It's highly recommended that you keep that blog and customize it for your needs rather than starting from scratch. From there, you can add other blogs fairly easily. This JumpBox is based on the 1.1 JumpBox Platform and includes a backup system that supports archiving the state of the JumpBox to NFS, Windows file shares, and Amazon S3.