Firestarter is an Open Source visual firewall program. The software aims to combine ease of use with powerful features, therefore serving both Linux desktop users and system administrators.
Firestarter features

Open Source software, available free of charge
User friendly, easy to use, graphical interface
A wizard walks you through setting up your firewall on your first time
Suitable for use [...]

GNOME Do allows you to quickly search for many objects present in your GNOME desktop environment (applications, Evolution contacts, Firefox bookmarks, files, artists and albums in Rhythmbox, Pidgin buddies) and perform commonly used commands on those objects (Run, Open, Email, Chat, Play, etc.).
GNOME Do is inspired by Quicksilver (http://quicksilver.blacktree.com) and GNOME Launch Box (http://developer.imendio.com/projects/gnome-launch-box).

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