RegiStar astronomical image registration software

RegiStar is a one-of-a-kind program that fully automates the task of aligning digital astronomical images. RegiStar shifts, rotates, and deforms as needed to precisely align images, even if they are at different scales or orientations or have been produced with different optical systems. RegiStar works on film or CCD images, and can register these very different types of images to each other. RegiStar can register all images in a directory with a single command, and has other powerful batch-processing capabilities. After two or more astrophotos have been aligned by RegiStar, they can be combined in various ways. Small images can be stitched together into a mosaic, photos can be stacked to improve image quality, or high-resolution tricolor images can be formed. RegiStar includes tools to form these composites, and also provides for images it registers to be assembled and manipulated using other programs.

http://www.aurigaimaging.com/

Free Astrophotography Software

Astrophotography exposure calculator - Program to calculate effect of polar axis misalignment - BASIC programs from first edition - Almanac program - EXIFLOG - Digital photo logging program - JPEG-to-FITS converter by Carlos Milian

http://www.covingtoninnovations.com/astro/astrosoft.html