Easily Track Course Usage by Public

I have a client that wants to provide short Articulate Storyline courses to the public and track who used them, even track quiz scores if possible. They are a nonprofit organization and do not have the resources to purchase an LMS unless it is very inexpensive. Does anyone have ideas for tracking completion of a web-based course? I would be open to ideas for 1. an inexpensive LMS that is in the cloud and lets people signup, 2. maybe doing something with a link from the last slide of the course to a web or MS form where they enter their name, and/or a link to a form that allows them to take a test and track their completion, etc. Thank you.