Powerful optical design library, and showing features, slide show, download, and register areas.

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.

Public domain mirror cell design program for 9, 18, and 27 point flotation cells.

Freeware, Version 7.4, program for designing and analyzing telescope configurations.