Design Drop is a site where you can upload a design and link it to a professor or teammate for critiquing. Feedback is given by selecting an area of the design and describing the issues related to that area in particular. Multiple users can comment on the design and the uploader can reply to the comments. Design Drop is free and anyone with the link can access and comment on the uploaded design. Design Drop is a great tool for crowd feedback, peer review, and even professor reviews.