If you don't plan on taking money-save time and opt for fiscal sponsorship. It boils down to an existing non profit allowing your operation to borrow its federal EIN and you getting the benefits of being a non-profit. You will still need to create a board and do all the other stuff-just later. They also charge. I've worked @ "projects" that were sponsored that charged 7-10% for the sponsorship. It often included all the back-end stuff.

I'd opt for an LLC and then consider becoming a "B-Corp" (look it up). It sounds like the technology may have a business model in the future. If you want to be part of it as a founder-and not an employee-don't opt for the non-prof route.

Ping me if you've got q's.