Association RADECS http://www.radecs.org/
RADiation and its Effect on Components and Systems. Updated information about RADECS association and RADECS conferences will be available on this site in English.
Communications Satellite Software http://www.satsoft.com/distributors.htm
SATSOFT is used for communication satellite antenna design, analysis, and coverage planning. Quickly assess antenna coverage and gain, conduct antenna sizing studies, develop shaped beam and multibeam antenna designs, and perform other satellite payload engineering tasks.
eclipse aerospace http://www.freewebs.com/eclipseaerospace/
Add-ons for orbiter space flight simulator created for educational purposes and includes spacecraft, satelittes, interplanetary probes and surface bases. Also competing in the virtual x-prize.