According to George Land, "Redback was developed by the SystemBuilder development team in Australia, hence the name (after an Australian spider). Of course SystemBuilder became part of UniData [in 1995], [merged with Vmark - ed], became part of Ardent, became part of Informix, became part of IBM, became part of Rocket."
http://www.cbronline.com/news/unidata_has_redback_web_application_development_toolkit