http://sr7wtu3yb6cv5zz4gshbjnc5cfofv5ulj6jkxgzej4zhupcsriahp6id.onion
But i believe it is only for the building part, it doesn't necessarily mean that those proprietary software will end up in icecat. For the Search engines I'd advise about running or using an instance of librex searxng, it's fairly easy to add those to icecat and at same time i don't want to change a bit from the original Icecat, reason why I did not add any of them.