Addresses is a GNUstep address book that consists of a full-featured address book manager application, a source-code compatible replacement for Apple's AddressBook.framework (for accessing and manipulating address data programmatically), a framework of view/editor classes that make it easy to use Addresses from your own programs, and a number of tools. It is easy to use by both users and programmers and can store almost all imaginable data, including multiple phone numbers, emails, and addresses, photos, AIM/Jabber/ICQ/Yahoo IM details, and notes. It supports drag-and-drop and integrates well with GNUMail.
The Apache::FileManager module is a simple HTML file manager. It provides file manipulations such as cut, copy, paste, delete, rename, extract archive, create directory, create file, edit file, and upload files. It also has the ability to rsync the server htdocs tree to another server with the click of a button.
Apollo is an open-source developer test skeleton toolkit for Java Web Start/JNLP. It lets you turbo-charge Web Start apps without Web Start to speed up your compile/run/test/debug/goof-off cycle, avoiding the hassle of stuffing, signing, uploading, or downloading your jars every time you rearrange a comma in your source code.
DJ Sweet provides a sophisticated component suite for SWT. The main focus is the improvement of the Web browser control and the addition of a Flash player with a simple API. It also offers other useful components like a multimedia player (based on VLC), an HTML editor (using FCKeditor or TinyMCE), and a syntax highlighter.