They had a great deal about sub-space by expanding on races from before them, much like the Terrans and Vasudans now do.
The fact that their technology is not as advanced as many here believe came out of the horses' mouth at Volition.
More than likely, their combat technologies included systems similar to the Avenger, but they did not have defensive or offensive systems capable of even puncturing Shivan shielding, this is known.
Despite warring with dozens of races, their empire more than likely collapsed in a matter of weeks. (much like the alliance would have fallen if it was not for GTI previous experience with Shivan technology which allowed for shield systems to be engineered quickly)
------------------
AceStaff member FreeSpace Watch
http://freespace.volitionwatch.com/