Moz - Backed by industry-leading data and the largest community of SEOs on the planet, Moz builds tools that make inbound marketing easy.
Effin Amazing UTM Builder - Add UTM tags to your links from a Chrome Extension
UpSeo - UpSeo is a best-in-class website traffic generator, allowing you to get more potential visitors to your website and enhance conversions.
UTMBuilder.net - Easiest UTM tags builder
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!
InterestExplorer - Discover 1000's of hidden Facebook interests to target.