There isn't a "fixed resolution", because it greatly depends on the camera that you use and how close to the object you would place it. Generally speaking, 0.3-0.5mm is reasonable to expect.
You would be able to save your scans as stl, obj and 3ds.
The software that analysis snapshots, builds a point-could and a 3d mesh would not be open source.
Yet the commands that control the scanner would be open, so if you would like to write your own software for it, you would be able to do it.
Right now we are writing software for windows, but we plan to write a Mac version later on this spring.
Don't see the answer to your question? Ask the project creator directly.