The Influencer Marketing Stack - Free resources to launch a killer campaign
Influencers by Buzzbomb - Find, manage and track influencers.
FindCreators.io - Find creators based on any keyword, for free
Top Instagram Influencers Ranking - Curated directory of Instagram bloggers by country&category
Reach - Mass messaging app for the iPhone
First 100 Influencers - List yourself as a top 100 Influencer in your Industry