Review / Ratings Plugin

Hi,
Can anybody recommend a good review / ratings plugin for WordPress?
I would like to be able to add a star rating to products I review on the site, but I would also like visitors to be able to add their rating.
Later on I plan to add a feature that allows visitors to write reviews themselves.
Ideally I am looking for a free plugin – or at least free to try.

See original post by uand.eye