Nifty - Manage projects, work, and communications in one place.
FameBit - Easiest Way to Find, Hire, and Work with YouTube Influencers
Intercom on Product Management - The ultimate resource for aspiring product managers
inzpire.me - An end-to-end solution for influencer marketing
Party Line - Use Slack to manage your projects
Insense & Paid Media - Find creators for short-term and long-term partnerships