Modern Optical Design and Analysis Software
- Powerful optical design library, and showing features, slide show, download, and register areas.
- http://members.kabsi.at/i.krastev/modas/

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.
- http://members.kabsi.at/i.krastev/jodas/

StarTrak - Making Setting Circles
- Software to plot setting circles for altazimuth mounts (eg Dobsonians) and equatorial mounts.
- http://www.startrak.co.uk/MakingSettingCircles.htm

ATM Optical Design and Analysis Software
- Freeware, Version 7.4, program for designing and analyzing telescope configurations.
- http://www.atmos-software.it/

Aberrator
- Freeware, Version 3.0, that generates star-testing images to show the effects of distortions influencing the quality of a telescope's performance.
- http://aberrator.astronomy.net/

Cell
- Public domain mirror cell design program for 9, 18, and 27 point flotation cells.
- http://www.davidchandler.com/cell.htm