The Live DVD build CAE Linux is a complete engineering toolkit for designing, simulating, testing, and creating/printing your own projects. Everything in the build is free and open source software, allowing you to design your device, do multiphysics simulations to optimize it, and generate the code for building it with 3D printing & milling. You can also design and develop your own printed circuit boards, and microcontroller circuits for automation. Not only do you not need to pay for a license for any of this (because of the GNU/Creative Commons licensing it comes with), you don’t even have to install it on your computer; it all runs directly off the DVD, being a Live Disc. This is pretty much the most powerful open source engineering package I know of, if you have any interest in the design and creation of anything from toy cars to advanced robotics, do yourself a favor and check out this build. You can find the download here, although I recommend visiting their home page to learn all about it and see what kind of support resources are also available.
It started out as a project to patch Android so you could run the open source operating system on netbooks and laggy tablets. They still have a long way to go before they have a run-anywhere version, but Release Candidate 1 of Android x86 shows some promise. With this build, you should be able to run Android on any computer, quite an improvement over having it stuck on your smart phone. Once they get the bugs out of it, it ought to be a lot of fun to be able to run all of those apps on your desktop.