Stellarium is a free open source science planetarium for your computer. It shows a realistic sky in 3D, just like what you see with the naked eye, binoculars or a telescope.
WriteOnline is an online word processing application for students. Users log on to the WriteOnline website, and can access word prediction features, text-to-speech, and other writing tools from any computer. Each student gets his or her personal online folders as part of the WriteOnline subscription, and they can save documents either online or to their own computer. Students' user preferences are automatically stored for them online, so the program starts up as they want it every time, on any computer.