Google Groups - Google Groups allows you to create and participate in online forums and email-based groups with a rich experience for community conversations.

Q-Stats - Get free marketing insights for every question on Quora.

DownToMeet - DownToMeet is a platform to organize, find, and attend group events.

Site Rank Data - View historical rank information of websites via time series charts.

Mighty Networks - Mighty Networks enables entrepreneurs, organizations, and companies to create and grow a community-powered brand.

Seoxan - check seo report for any website, alexa ranking, server information, meta tags, authority, page speed and more