I'd like to use something like this for making and iterating user-testable prototypes with team members who might not know how to use version control, text edit

I'd like to use something like this for making and iterating user-testable prototypes with team members who might not know how to use version control, text editors, IDE's, etc. I work with smart entrepreneurs and designers who can can do some technical stuff, but shouldn't need to spend their time googling installation instructions and git commands.