I know of three others (not mentioned on Open Luna's site):
* DevelopSpace, founded by Paul Wooster - http://wiki.developspace.net/Main_Page
* Open Aerospace, founded by Ralph Ewig - https://www.open-aerospace.org/tiki-index.php
* Mach 30: Foundation for Space Development, founded by J. Simmons (me) - http://mach30.org/

Have you seen the list of Open Engineering Tools over at DevelopSpace (http://wiki.developspace.net/Open_Source_Engineering_Tools)? Not sure if it helps with the immediate need, but it is the most comprehensive list of open source tools for all things engineering I have found.