UserVoice - UserVoice integrates easy-to-use feedback, helpdesk, and knowledge base management tools in one platform that empowers users to speak and companies to understand.
Q-Stats - Get free marketing insights for every question on Quora.
Freshdesk - Freshdesk is a cloud-based customer support software that lets you support customers through traditional channels like phone and email, social channels like Facebook and Twitter, and your own branded community
Seoxan - check seo report for any website, alexa ranking, server information, meta tags, authority, page speed and more
Zendesk - Zendesk is a beautiful, lightweight help-desk solution.
HypeStat - HypeStat is free statistics and analytics service, where you can find information about every website.