Camelcamelcamel - Easily monitor Amazon product prices and get alerts when they drop.
GupShop - Avoid fake reviews and Get suggestions from your friends to buy best products.
Pricy - Amazon price watch
Tag - Add clickable product tags to any image and share anywhere.
Price Tracker by Relbis Labs - Price Tracker is a command-line tool for monitoring the prices of productsFeaturesTracking prices and availability of products.Tracking Amazon Kindle books.Displaying products information in a terminal.Exporting data into Excel and YAML files.
Primo - Like Amazon's 1-click shopping--but for everything