Martechbase - A searchable database of 7,000+ marketing tools
Site Rank Data - View historical rank information of websites via time series charts.
MartechGuru - Keep track of your marketing technology SaaS contracts easily. No more spreadsheets.
Q-Stats - Get free marketing insights for every question on Quora.
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Seoxan - check seo report for any website, alexa ranking, server information, meta tags, authority, page speed and more