Algodoo

Including some cool things, like:

-The 8 recognized planets.
-Natural satellites, such as Moon, Titan, Europa, Triton, Charon...
-3 of the Dwarf planets, which are Pluto, Ceres and Eris
-Comets, which are Halley and Hale-Boop
-Asteroid Belt, having the 10 first asteroids, which are 2 Pallas, 3 Juno, 4 Vesta, 5 Astraea, 6 Hebe, 7 Iris, 8 Flora, 9 Metis and 10 Hygeia
-Centaurs, which are 2060 Chiron (Darker), 10119 Chariklo (Ringed) and 65489 Cetus (Normal)

Asteroid belt asteroids:

1 Ceres - Circle
2 Pallas - Hexagon
3 Juno - Oval
4 Vesta - Rectangle
5 Astraea - Pentagon
6 Hebe - Moon (Concave Digon)
7 Iris - Star
8 Flora - 4-Petaled Flower
9 Metis - Eye (Convex Digon)
10 Hygeia - Concave Hexagon