The Influencer Marketing Stack - Free resources to launch a killer campaign
FameBit - Easiest Way to Find, Hire, and Work with YouTube Influencers
Twtrland - Build your twitter presence and connect w/ influencers
Smarp - Smarp is an employee advocacy SaaS solution that turns employees into brand ambassadors and influencers.
inzpire.me - An end-to-end solution for influencer marketing
Top Instagram Influencers Ranking - Curated directory of Instagram bloggers by country&category