Baobab is a C/gtk+ application to analyse disk usage in any Gnome environment. Baobab can easily scan either the whole filesystem tree, or a specific user-requested directory branch either on the local system or on a remote system.
Inspired by QuickSilver for Mac OS X, Katapult is an application launcher for KDE designed to allow faster access to applications, bookmarks, and other items. It is plugin-based, so it can launch anything that is has a plugin for. Its display is driven by plugins as well, so its appearance is completely customizable. It was inspired by Quicksilver for OS X.
GNOME Do (Do) is an intelligent launcher tool that makes performing common tasks on your computer simple and efficient. “GNOME Do” not only allows you to search for items in your desktop environment (e.g. applications, contacts, bookmarks, files, music), it also allows you to specify actions to perform on search results (e.g. run, open, email, chat, play).
Byzanz is a free opensource GNOME based Command-Line utility to capture desktop recording software for linux. This should probably be the coolest command-line utility that I have seen in recent days. Byzanz records your desktop session to an animated GIF. You can record your entire screen, a single window, an arbitrary region or even follow the cursor. Given that it is only a GIF format makes it even more an interesting proposition as the file size is going to be very small.
Tomboy is a desktop note-taking application for Linux and Unix. Simple and easy to use, but with potential to help you organize the ideas and information you deal with every day. Tomboy is written in C# and utilizes the Mono runtime and Gtk#. Automatic spell-checking is provided by GtkSpell.
Banshee is a simple but powerful multimedia player with Audio/Video playback support, subscribe and playback podcasts and last.fm radio from Banshee. With Banshee1.2 Import, organize, play, share your music and videos using Banshee’s simple but powerful interface. Rip CDs, play and sync your iPod, create playlists, and burn audio and MP3 CDs
Screenlets are small owner-drawn applications (written in Python) that can be described as “the virtual representation of things lying/standing around on your desk”. Sticknotes, clocks, rulers, youtube, gmail and more. Screenlets are free opensource software released under GPL License. Screenlets use GTK2 & Cairo for drawing and windowing.
The Daily Ubuntu attempts to make options for Ubuntu Linux users a bit more manageable by presenting a new application for the Ubuntu Linux operating system on a daily basis. They can range from audio programs such as Audacious and Amarok, to more business-oriented things like gLabels.