It looks like gEDA is mature enough and could even be used to produce netlists in the yet to be finished XML format.
However, when trying to capture the first parts of Space Race in gEDA I'm stuck with two gates E9 both with pins 1+2 and I can't find the knob to turn to assign different pin numbers (13+12 and 11+10). If changing pin #s is so well hidden as it seems to be, capturing could become a very tedious job.
Edit: Never mind! I found it (e Shift+S for edit slot). I'll go and recapture Space Race then. If someone wants to do Pong or Rebound... go ahead :-)