Schnack - Schnack is an open source commenting system written in JavaScript.
Img.vision - Image hosting & video hosting for eCommerce sellers
GitHub Team Discussions - Now there's more space to talk through your projects 💬
UploadHouse - Thumbnail and resize your photos and images
Product Hunt Reviews Widget - Embed and encourage PH reviews into your product
ImageVenue - ImageVenue is a great online hosting service that allows uploading pictures for showing creative works with a simple-to-use technique.