It works on all computers because it works in your browser. I can even run it on my cell phone.
It doesn't have nearly all the bells and whistles of the Windows version. You can't even save your simulations (at least not yet!)
It also behaves quite differently on different computers.
This is a recreation of the solar system barycenter simulation:
http://orbitsimulator.com/gravitySimulatorCloud/ssBarycenter.html This traces the pentagram of Venus caused by the near 13:8 resonance between Venus and Earth
http://orbitsimulator.com/gravitySimulatorCloud/venusPentagram.html This shows all the Moons of Jupiter
http://orbitsimulator.com/gravitySimulatorCloud/joviansystem.html This shows the motion of the Spitzer Space Telescope. Scroll down for a rotating frame version.
http://orbitsimulator.com/gravitySimulatorCloud/spitzer.html Voyager 1 approaches Jupiter. It makes very close flybys of Io, Ganymede and Callisto before heading off for Saturn.
http://orbitsimulator.com/gravitySimulatorCloud/voyager1JupiterApproach.html Super-massive black hole at the center of the Milky Way
http://orbitsimulator.com/gravitySimulatorCloud/mwbh.html This one is user-controlable!
Deflecting Apophis. Apophis won't hit Earth in 2029, but it will make a very close approach. During this approach, if it passes through a "keyhole", it will return to strike Earth in 2036. Scientists are certain that it won't pass through this keyhole. But "what if"?
This simulation begins in 2014. This simulation gives you 3 Apophises. The one called Apophis is based on Apophis' actual trajectory. But a mere 10 kilometers away sits a pair of 'keyhole Apophises'. They will pass through the keyhole. They will return to strike Earth in 2036. The "Vectors" interface lets you control them. Leave one of them alone to act as your experimental 'control'. See how much delta V it takes to nudge the other one off course so it misses the 2029 keyhole. Just edit the velocity, and it will take off on a new trajectory.
This simulation controls the time step for you. It also pauses prior to Apophis' close approaches to Earth. You can override the time step, but don't. If you go faster than 2048, and 32 when Apophis is in Earth's vicinity, you will not get accurate results. The simulations takes care of this for you. It takes some time for this simulation to develop, so be patient. The sim will automatically pause a few days before Apophis' close approaches, so you won't return to your computer to discover you've missed it.
http://orbitsimulator.com/gravitySimulatorCloud/apophis2014.html Trojan planet
Adjust the mass of a planet and its trojan companion to see what mass ratios are stable.
http://orbitsimulator.com/gravitySimulatorCloud/trojanratio.html Turn off Sun's gravity
In demonstrating Newton's Laws, it seems to be a common conceptual question: What path would the planets follow if the Sun's gravity were somehow turned off? With the press of a button the students can find out.
http://orbitsimulator.com/gravitySimulatorCloud/turnOffSunGravity.html A binary star system with planets
This is one of the original Gravity Simulator simulations.
http://orbitsimulator.com/gravitySimulatorCloud/casella.html If the Moon orbited the Earth in a polar orbit, it would crash to the Earth in under a decade due to the Kozai Mechanism.
http://orbitsimulator.com/gravitySimulatorCloud/kozaiMoon.html Earth captures an asteroid. In 2006, Earth captured 2006 RH120, It spent just over a year orbiting Earth before escaping back into interplanetary space.
http://orbitsimulator.com/gravitySimulatorCloud/capturedmoon.html