It's stated that the rings are ancient tech and there are a few other things that are known to be ancient technology or derivitive, but it seems that they tend to leave the technology in the form they found it in. We also know that the Goa'uld stole their ship tech, however the designs and efficiency look nothing like the Asgard, Ancient, or Nox designs we've seen.
Is there any info as to where the ship tech came from?
My best guess is that it came from the Furlings. This makes sense to me, because the Furlings, acording to the "supposed to be canon games" say that the Furling created the Goa'uld and the few tech pieces we've seen from them seem to be fairly primitive and unimpressive compared to the other advanced races. Are ther any canon sources that support this or say where their ship tech comes from? And if it comes from the Furlings, why it is so weak comparitively to the other 4 in this alliance?