Camera Roll - Simple Gallery App for Android, with lovely Material Design.
Sociall (Beta) - A secure and private decentralised social network for all.
Image Hunter - Image Hunter – Search By Image is a tool that allows you to upload an image or images directly from your mobile device and find all the other existing sources of the image on Google.
Manyverse - A social network off the grid
JS Image Finder - JS Image Finder: Image Search is a powerful, simple, and easy to use application that allows you to search for images from the internet using popular search engines.
data.world - The social network for data people