Nerite sails are very popular now in an aquarium hobby. Most of them, however, do not breed in fresh water. But, here in Europe, we actually have our own 100% freshwater nerite snails Theodoxus fluviatilis. Not only do they breed in completly freshwater rivers, but they also don't mind cold water.
These snails are also known as River Nerite
A close-up of Theodoxus fluviatilis
Another close-up of Theodoxus fluviatilis. As you can see, for some reason, these nerites like to lay eggs on each other's shells. You can see two eggs in the bottom right snail. I have a bunch of them in my aquarium right now. They do fine in both cold water tanks and in tropical ones. While they do breed pretty well in aquarium, the do not over populate like other snails. They are pretty good at cleaning algae and all sorts of slime of the glass. While they look pretty neat, they only downside is that they are much smaller than your typical tropical nerite. They are about ladybug size.