Img.vision - Image hosting & video hosting for eCommerce sellers
Startup Security Program by Templarbit - Security practices & tools required to close large deals
UploadHouse - Thumbnail and resize your photos and images
Google Capture the Flag 2017 - Google's 2nd annual worldwide security competition
ImageVenue - ImageVenue is a great online hosting service that allows uploading pictures for showing creative works with a simple-to-use technique.
The Security Checklist - The Practical Security Checklist for Web Developers