
1. Iconians
2. Tkon Empire
3. Promillians
4. Menthars
5. Dyson Sphere Builder's (could have been built by the Tkon's or Iconian's......... so this "race" is only a possibility)
We know the Fedeation knows all this, but I have to to hear of any Federation or Starfleet agency dedicated to the locating and analysis of such ancient artifacts. Do they not see the value? Even the "primitive" Menthars had technology, the Aceton Assimilator, which could have been useful for the Fed, I mean this technology almost depopulated a Galaxy Class Starship after almost 1000 years of inactivity.
In my opinion it is simply sheer stupidity that Star Fleet or the Federation dosent have an IPX equilvent (IPX was an agency in Babylon 5 dedicated to the finding and exploiting of ancient alien technology) or a program dedicated to gaining technological advancements (even from races with technogical superiority and vast databases, like the borg..... just imagine what Starfleet could learn if they accessed the Borg "Library of Congress".