UserTrue - Free peer to peer app reviews. Give a review, get a review for free.
5play.ru - 5play.ru enables you to download highly-rated Apps and Games for Android devices.
AppReviewDesk - App Review Exchange, Free App Websites , Twitter Marketing for apps.
iOSGODS! - iOSGODS!
Review Lancer - Reviewlancer also provide a platform for Developers or Marketers to free exchange app reviews and ratings. Now market your app for zero budget.
Altstore - A home for apps that push the boundaries on iOS