ECIR - Pay for likes, followers, comments and more from real people
SmartBribe - Get free traffic to your site (turn one visitor into three)
Social Review - Easy audits for social media.
Dibz - Put your link building efforts on autopilot
SE Ranking - All-in-One cloud-based SEO software for agencies, marketing teams and webmasters
Shortlist Metrics - A simple tool to help you scale your link building faster