Apphi - Apphi – Schedule Posts for Instagram is a Free to Use Mobile Application that automatically posts your scheduled Instagram photos and videos.
Img.vision - Image hosting & video hosting for eCommerce sellers
Regrann Pro - Regrann Pro is one of the best reposting apps for Instagram that enables its users to repost Instagram videos and images without adding watermarks.
UploadHouse - Thumbnail and resize your photos and images
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.
ImageVenue - ImageVenue is a great online hosting service that allows uploading pictures for showing creative works with a simple-to-use technique.