Soovle - Soovle is a customizable search engine provides the search suggestion of the best provider on the net.
SheerSEO - SheerSEO helps you to track Google Search Engine Rankings for critical keywords. PageRank, Back Links and more.
Google Trends - Explore Google trending search topics with Google Trends.
Keyword Discovery - Keyword Discovery is a keyword research and analysis tool.
Moz Analytics - Moz Analytics is the most popular SEO (Search Engine Optimization) tool that uses both basic and advanced research tools to enhance your traffic.
iSpionage - AdWords competitor keywords with the click of a button and monitor competitor PPC landing pages.