Freedoom was the only one that had any kind of success and I think it's still not finished. Open Quartz died in the water, Openarena 3 is never coming, Cube and Assaultcube are totally dead, Warsow is only played sporadically by a small tribe of french racists now, Tesseract never went anywhere which is a shame because the tech actually looked really cool at the time, etc etc.
more FOSS games would be nice.
thinking about it, I guess these games failed because by the time they got to a playable state the games they were based on had completely ceased to be relevant to anyone but the hugest fucking nerds.
