Drupal is a modular content management system, forum, blogging and community engine. It is database driven and can be used with MySQL, MariaDB, PostgreSQL, and SQLite. Its features include (but are not limited to) discussion forums, Web-based administration, theme support, a submission queue, content rating, content versioning, taxonomy support, user management with a fine-grained permission system based on user roles (groups), error logging, support for content syndication, locale support, and much more. It is considered to be an excellent platform for developers due to its clean code and extensibility, and it can also be used as a Web application framework.
Mediabird allows students to document and review their study effort using a collaborative notepad. The Web2.0 application allows for taking notes on a personal notepad. A virtual text marker allows the students to highlight their notes and ask questions about the highlighted parts. The sharing feature allows study groups to share and discuss their notes as well as questions they have created. By-and-by, the students collect answers to the questions. Pairs of questions and answers are collected in a card box that allows for memorizing the important facts later on (e.g. for an exam or presentation). The program is also available as a Moodle activity.
EternalCMS is a content management system. It is built on top of Zend Framework, which helps promote cleaner code, better performance, and faster development. Some of its major features are the ability to post multi-page articles with unlimited categories and sub-category support, a bidirectional RESTful API, a user management system with multi-level ACLs and optional account activation, an optional moderation queue, RSS/Atom/MRSS feeds, and user profiles.
EZPX is a lightweight photoblog engine with all the features you need and a user interface you'll love to use. It can be used as a standalone photoblog application or as a Flickr agent. It features an easy installer/upgrader that notifies you when an upgrade is available, support for templates, and much more.