Simulator

A free, open-source web app for creating and simulating 2D geometric optical scenes.

Sky Map (formerly Google Sky Map, open sourced in 2012) - GitHub - sky-map-team/stardroid: Sky Map (formerly Google Sky Map, open sourced in 2012)

5-10x Faster Discrete Event Simulation

Planetary motion

Explore the night sky tonight from your location. Try this exquisite stargazing tool. Take an effortless journey through thousands of stars, planets and constellations.

Stellarium Web is a planetarium running in your web browser. It shows a realistic star map, just like what you see with the naked eye, binoculars or a telescope.

Stellarium is a planetarium software that shows exactly what you see when you look up at the stars. It's easy to use, and free.

TheSkyLive.com provides detailed information, precise position and sky charts for the most import Solar System and Deep Sky objects

LabVIEW is a graphical programming environment engineers use to develop automated production, validation, and research test systems.