Today I came across an Open Source project called Marble. It's an alternative to Google Earth that is available for Linux, Windows, and Mac. Marble is part of the KDE Education Project and is available under the GNU LGPL (Lesser General Public License).
It's an amazing piece of software with a multitude of features. It even has map data for Mars & Venus. It's available through the standard Ubuntu repositories so give it a blast:
Due to the antitrust suit against Microsoft an update has been deployed to prompt the user to select which web browser they wish to use. On first glance it seems to just provide options for the most common browsers Chrome, Firefox, Safari, Opera, and Internet Explorer, however scrolling to the right reveals that there are in fact twelve options to choose. The selection is actually quite interesting.
When I was in my early teens Lucas Arts released a brilliant point and click adventure game called Day Of The Tentacle. I played the disk-based version of this game on my older brothers 286 PC (which was old even back then). Today, thanks to ScummVM, I've been able to play it again under Ubuntu Linux.
There are other classic games that can run on ScummVM including The Secret Of Monkey Island, Sam & Max, Broken Sword, and many others.