The Influencer Marketing Stack - Free resources to launch a killer campaign
inzpire.me - An end-to-end solution for influencer marketing
Twtrland - Build your twitter presence and connect w/ influencers
Insense & Paid Media - Find creators for short-term and long-term partnerships
FameBit - Easiest Way to Find, Hire, and Work with YouTube Influencers
Top Instagram Influencers Ranking - Curated directory of Instagram bloggers by country&category