Product Hunt Reviews Widget - Embed and encourage PH reviews into your product
TheReviewIndex - An Amazon review summarizer using neural networks
Reviews for iOS - Keep track of your App Store reviews
ReviewBay - Aggregates the best reviews of Amazon products.
BuzzFeed Reviews - The best things at 3 price points. A Wirecutter competitor.
Fakespot - Fakespot spots, analyzes and identifies fake reviews - helping you out when buying stuff online