As long as you follow the "1-inch of fish per gallon of tank water" rule the following fish can be appropriate in a 10 gallon:
Platies
Guppies
Neon Tetras
Glowlight Tetras
Black Neon Tetras
Balloon Mollies
White Cloud Minnows
Cory Cats
Cherry Barbs
Dwarf Gouramis
Just to name a few. The best thing to do is look up some information on fish you're interested before buying them to ensure the correct tank size, school size, and number of fish.