Gravit is a simple, light weight application that allows you to simulate gravity.
If you're a fan of sandbox games or simulators, Gravit will satisfy your creativity and curiosity. Gravit is basically a sandbox for testing out how gravity works. You can adjust different aspects like mass and acceleration.
While it's cool to see your creations play out in a simulation, the app is extremely difficult to tweak. There's nothing within the program that you can actual use to adjust parameters. To adjust anything within the app, you have to open up a configuration file in a text editor. From there you can change the variables.
Gravit comes with a screensaver too, which makes for some interesting visualizations while you're away from your computer.
Overall, Gravit is fun and interesting only if you're willing to deal with an unintuitive interface for adjusting parameters.