Img.vision - Image hosting & video hosting for eCommerce sellers
SlidesPPT - Beautiful free presentation templates for Google Slides
UploadHouse - Thumbnail and resize your photos and images
Slidebean - Presentations that design themselves
ImageVenue - ImageVenue is a great online hosting service that allows uploading pictures for showing creative works with a simple-to-use technique.
Selfone - Free template for PowerPoint, Keynote and Google Slides