Explore Keywords - Free keyword research tools
Product Hunt Reviews Widget - Embed and encourage PH reviews into your product
Keyword Spy - Get competitive data on other people's AdWords sem bids.
Reviews for iOS - Keep track of your App Store reviews
KeywordTool.io - KeywordTool.io is the best FREE alternative to Google Keyword Planner and Ubersuggest. It uses Google's autocomplete feature to get over 750+ long-tail keywords for any given query.
Diffbot - Get data from web pages automatically