"OpenRocket is a free, fully featured model rocket simulator that allows you to design and simulate your rockets before actually building and flying them."
"Jolicloud is super easy to install, and you've got options.
Jolicloud + Windows
Computer with Windows and Jolicloud
* Choose Windows or Jolicloud at start up
* Use your Windows files from Jolicloud
* Remove Jolicloud at any time"
Scribus is an open-source program that brings award-winning professional page layout to Linux/Unix, MacOS X, OS/2 and Windows desktops with a combination of "press-ready" output and new approaches to page layout. Underneath the modern and user friendly interface, Scribus supports professional publishing features, such as CMYK color, separations, ICC color management and versatile PDF creation.
Interested in the open source OS but unsure what to try? Linux has always been the outsider's operating system. Even more hipster than Apple's iOS and completely off the radar of most Microsoft Windows users, the open source OS umbrella covers an ever increasing collection of mutations and flavours, known to its users as distros (short for distributions).