I recently came across the Undergraduate Research Commons and thought I should share it with you. It is a portal where you will have access to hundreds of full-text undergraduate research papers from a large number of participating educational institutions worldwide. These include engineering capstone projects, faculty-supervised research, award-winning papers, peer-reviewed journal publications and so on.
You may browse by participating institution or type of documents, and find out the popular papers in each subject area. Of course, it also allows users to search by keywords. If you are interested in exploring the content, simply click on the info graphic at the left-bottom corner of the homepage to regroup the content by different criteria.