Check out this list of the best product review websites for Business-to-business and Business-to-consumer companies. Keep in mind that every industry has niche sites, too. For instance, those in the restaurant industry may want to be on UrbanSpoon. This blog post won't get into sites that are specific to one industry, but it will provide review sites that apply to businesses in almost any industry.
https://blog.hubspot.com/blog/tabid/6307/bid/33741/12-places-businesses-should-be-collecting-online-reviews.aspx/
