Depending on the industry you are in there are some industry specific 3rd party sites which will give you a widget to add to your site.
Additionally for WordPress there are some plugins which can pull in reviews from Google / Yelp / Bing
If you are not using WordPress - I believe that you can still pull in from Google / Yelp / Bing, but you will need to google for the scripts / widgets you need to insert onto the page
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