Astra Image is a fully featured application for doing advanced image processing. It is commonly used for astronomical and other scientific images, remote imaging, microscopy, as well as every-day photos. Astra Image combines many powerful features in a single, easy-to-use application. Some of the core features are also available as Adobe Photoshop plug-ins.
Astra Image is used and trusted by thousands of customers worldwide, including camera manufacturers, research laboritories, astronomical observatories, government agencies, photographers and hobbists.
You can download it here.