http://www.removeem.com/ratios.php Link Research, Technical SEO Worried about Google's Penguin algorithm hitting you for over-optimized anchor text? Simply type in your URL for a full report of which links might raise flags.
2. Bing Webmaster Tools
http://www.bing.com/toolbox/webmaster Tools Suite, Diagnostic Similar in function to Google Webmaster Tools, Bing offers a suite of interesting research tools and resources for webmasters.
https://bitly.com/ Social, Analytics Most people use Bitly for URL shortening, but the real power of this platform comes from its analytics.
http://www.boomeranggmail.com/ Email, Productivity Boomerang lets you follow up on emails, even when you forget. Great for link building or any time you send a lot of emails.
https://bufferapp.com/ Social Optimize your online social media sharing. Buffer allows you to share with your audience at the optimal times for greater visibility.
http://builtwith.com/ Competitive Intelligence Use BuiltWith to discover what technology nearly any website was, well, built with. Great for competitive intelligence as well.
7. Buzzstream Tools Suite
http://tools.buzzstream.com/link-building Link Building, Tools Suite, Email Most people know Buzzstream as an outreach platform, but they also offer a number of free link-building tools. This company gets it.
8. Caption Tube
http://captiontube.appspot.com/ Video Free and easy resource used to create captions for YouTube. Helps with usability and offers viewers a readable transcript.
http://www.circlecount.com/ Social, Analytics Google+ analytics ramped up. Free resource to track your followers and analyze your shares. See how many followers you've gained over time.
10. Content Strategy Generator Tool
http://seogadget.com/content-strategy-generator-tool-v2-update/ Content This tool from SEOgadget helps you plan your content strategy intelligently, using keyword research and estimating your audience size.