Avalon (capital planet)
Population: Avalanians
Moon: No
In-Depth: click here
Special Features: None
Earth 
Population: Humans
Moon: Yes
In-Depth: click here
Special Features: 2 Masters, Dragonballs
Kanassa 
Population: Kanassans
Moon: Yes
In-Depth: click here
Special Features: Spending two weeks on the planet will teach you the ability Telepathy. Spending four weeks here will teach you telekinesis.
Namek 
Population: Namekians
Moon: No
In-Depth: click here
Special Features: 1 Master, Dragonballs