darktable is an open source photography workflow application
Lightweight, pure-Swift library for downloading images from the web
Fast, secure image processing server and Go library, using libvips
Fast, simple, scalable, Docker-ready HTTP microservice
Graphic Live Mixer
Haytham is an open source gaze tracker
Astrophotography
OTB is an open-source C++ library for remote sensing images processing
Python-accessible toolkit for Geoscience & Remote Sensing Applications