GetBoo is a Web 2.0 bookmarking system, both social (with tags) and private (with folders). You can import and export your bookmarks from Firefox, IE, Mozilla, and Netscape. It has an admin management section, translations, groups, bookmarklets, a Firefox extension, RSS feeds, and more.
Contao is a content management system (CMS) for people who want a professional Internet presence that is easy to maintain. The state-of-the-art structure of the system offers a high security standard and allows you to develop search engine friendly Websites that are also accessible for people with disabilities. Furthermore, the system can be expanded flexibly and inexpensively. It features easy management of user rights, a Live Update Service, a modern CSS framework, and many integrated modules (news, calendar, forms, etc.).
DBLIB is a PHP library to create WWW interfaces to databases. Its main aim is to support creating interfaces for site administrators, but it can be used as well to create public end-user interfaces. It features over 15 widget types (text, numbers, datetime, password, reference to another table, etc.), automatic data conversion and escaping, automatic input checking in all fields, an abstract data layer that supports several SQL databases, LDAP, and text/dbm files. DBLIB is not a low-level database manager like PHPMyAdmin.
RheaVFS allows you to turn an archive into a virtual directory, so all files in the archive can be accessed as if they were in the virtual directory. This works transparently for all programs without any need to modify them. Currently there's read/write support for zip, tar.bz2/gz and gpg encrypted files.
Notion is a tiling tabbed window manager for X. This means the screen can be freely divided into tiles that contain the client windows. Multiple client windows can occupy the same tile; in that case they will be tabbed, much like browser tabs. This way, windows will not overlap and it becomes easier to manage your screen real estate. Its functionality can be configured and even extended with Lua scripts. Various scripts are available, such as for NetWM features and multihead support.