ImageMagick is a free and open-source software suite for displaying, converting, and editing raster image and vector image files.

XnConvert is a powerful and free cross-platform batch image processor, allowing you to combine over 80 actions.

gThumb is an image viewer and organizer with a couple of limited options to also edit images.

Bloom is an end-to-end protocol for identity attestation, risk assessment and credit scoring, entirely on the blockchain.