This is a list of open access journals which do not meet the standards to which scholarly journals must be held, including, but not limited to, undergoing peer review. This list also contains a link to criteria scholarly journals must meet.
Personally I don’t think I’ve ever looked up a health topic on Wikipedia; I use WebMD for that. Which isn’t crowdsourced, I don’t think — I think they pay people to write the content on WebMD. Still, nice idea to offer college credit!