REPOST IT! FOR INSTAGRAM - REPOST IT! FOR INSTAGRAM is an easy-to-use app by Digi set though which you can schedule desired posts to upload them on Instagram automatically.
FameBit - Easiest Way to Find, Hire, and Work with YouTube Influencers
Apphi - Apphi – Schedule Posts for Instagram is a Free to Use Mobile Application that automatically posts your scheduled Instagram photos and videos.
inzpire.me - An end-to-end solution for influencer marketing
Repost FOR Instagram - Repost FOR Instagram is a social app that enables you to quickly post all saved photos and videos from your phone to Instagram.
Insense & Paid Media - Find creators for short-term and long-term partnerships