Moz - Backed by industry-leading data and the largest community of SEOs on the planet, Moz builds tools that make inbound marketing easy.
Buzzstream - Build Relationships. Build Buzz. Web-based software that helps the world’s best marketers promote their products, services and content.
SEO PowerSuite - Get all SEO tools in one pack - download free edition of SEO PowerSuite and get top 10 rankings for your site on Google and other search engines!
FameBit - Easiest Way to Find, Hire, and Work with YouTube Influencers
SEO Tools Centre - SEO Tools Centre provides SEO checker services for websites.
Meltwater - Media monitoring, social media monitoring & media Intelligence products & tools help companies grow and build brands by listening, understanding, engaging and benchmarking their customers, markets and social business communities.