DoudouLinux is a system specially designed for children 2 years and up. It is available as Live CDs and USB keys as well as ARM images. The main goals are to be as easy to use as a game console, provide as many kid-oriented applications as possible (currently around 50), drive small children into mastering computer use from age 2, be natively in child-friendly language without any action, be simple for Dad and Mom too (no administration, no updates; it’s a read-only system). It includes Web content filtering.
Dr. Higgins will teach you and help you teach yourself any language. It works like a quiz, asking you the translations of words and keeping score of your correctness. It includes a number of quizzes for self-study in different languages (English, Spanish, Finnish, and a bit of Japanese). It's very easy to add your own lists, thanks to a simple file format.
Drivel is a GNOME client for working with online journals, also known as weblogs or simply blogs. It retains a simple and elegant design while providing many powerful features, including support for LiveJournal, Blogger, MovableType, Advogato, and Atom journals. (Systems based off these are also supported, including WordPress and Drupal.)
Dump Truck for Mac allows you to securely store, sync, and share all your photos, files, and documents online and access them anywhere. It doesn't rely on third parties to store your data or use data deduplication to inspect your data. The authors own their own storage infrastructure and store three copies of each file using 256-bit encryption. Android, iOS, and Windows apps are also available.
EPESI is a Web application for managing business information. It allows you to store, organize, process, link, and share records between people within a single company or organization. Standard features include a shared calendar, tasks, and address book, an integrated Roundcube e-mail client, an advanced permission system, easy form filling (Click2Fill), record change tracking (Watchdog), and full record history. Its modular design can be easily customized and modified to match your processes and workflow. The EPESI framework allows rapid development of custom modules and extension of the functionality of the basic CRM package into full ERP applications.