CalDavZAP is a CalDAV Web client with a powerful event/todo editor. It is compatible with Safari, Webkit, Firefox, Opera (15+), iCab, and Chrome, and supports all major CalDAV servers.
QStode is a Web application which allows registered users to store bookmarks (like the old del.icio.us) categorized by tags.
CardDavMATE is a CardDAV Web client with a powerful vCard editor. It is compatible with Safari/Mobile Safari, Webkit, Epiphany, iCab, Chrome, Firefox, and IE9, and supports all major CardDAV servers.
A standalone script for accessing MySQL databases.
A lightweight library containing a number of classes and functions to ease the task of programming GTK+ programs with C++ in POSIX environments.