What are your favorite pre-revenue stocks?

Hey everyone, since this is r/stocks lets talk about some of the risky stuff.

1. What are your favorite pre-revenue stocks
2. What is your forecast for it in the next: 1, 2, 3, 5 and 10 years (can be a range).
3. What are some risks/milestones
4. Why do you like it
5. What do they do?