http://www.worldofspectrum.org/showwrap.cgi?permit=houses/Sybilasoft.pmt
"Explanation to different variants of Sybilasoft
company name. We were group of about 5-6 people
producing software on noncommercial basis just for
fun. So the name depended on actual author of text in
each adventure. Possible variants were Sybilasoft,
Sibylasoft and Sybila soft used by Stano Hrda, Martin
Sustrik and Michal Hlavac in the same order."