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Aberrator - Freeware, Version 3.0, that generates star-testing images to show the effects of distortions influencing the quality of a telescope's performance.
ATM Optical Design and Analysis Software - Freeware, Version 7.4, program for designing and analyzing telescope configurations.
Cell - Public domain mirror cell design program for 9, 18, and 27 point flotation cells.
Java Based Optical Design and Analysis Software - Based on telescope design program MODAS, can design and analyze one mirror and classical two or three mirror telescopes, one mirror catadioptric systems, two mirror catadioptric systems, doublets and triplets, and includes applets.
Modern Optical Design and Analysis Software - Powerful optical design library, and showing features, slide show, download, and register areas.
Ronchi for Windows - Program that simulates the appearance of a mirror while undergoing the Ronchi Test.
StarTrak - Making Setting Circles - Software to plot setting circles for altazimuth mounts (eg Dobsonians) and equatorial mounts.