Kerbal Space Program (commonly abbreviated as KSP) is a beta-stage sandbox-style space flight simulator game, currently in development for Windows and Mac OS X. Players assume the role of commanding many aspects of the Kerbal space agency including mission planning, rocket design, and space navigation and piloting. Kerbal Space Program supports game mods and currently has an active modding community.
Source: Wikipedia, "Kerbal Space Program", available under the CC-BY-SA License.
- Kerbal Space Program fan - Jebediah