Thunderbird is a total redesign of the Mozilla mail component to produce a cross-platform, stand-alone mail application using the XUL user interface language. It has many new features, among them the ability to customize your toolbars the way you want them. a new look and feel with a large number of downloadable themes which alter the appearance of the client, and the ability to add UI extensions.
Gelide is a configurable multi emulator and multi system front-end that lets you manage any kind of emulated system (PC, console, arcade, etc.). Gelide lets you catalog and launch any game from any existing emulator under GNU/Linux. You can configure any emulator with command line parameters support.
xJigsaw combines xjig with a simple GUI which allows easy creation of jigsaw puzzles. There is no need to install xJigsaw, and it does not need xjig. Everything is in a single file. Just download it, unzip it, and run it. It works with png, gif, jpg, tif, and bmp images, and offers image previews. The user can fix the rotation angle of puzzle pieces when dragging and can choose different shapes for the puzzle pieces. Puzzle pieces snap to 90 degree angles. The user can swap mouse buttons, set the width of the puzzle, and set the number of puzzle pieces.