I still use GCS and think it is still capable of making a good game,I have tried many engines and keep going back to it,it has no restrictive license,it is easy to use and the AI add on is excellent,I haven't got a website or any examples of what I can do with it yet but there are two games that show exactly what has been done with it you may want to check out, Pencil Whipped by Lon Flickinger and Infiltration by Bob Hindle.
http://www.realityfactory.ca/chiselbrain/
http://www.skyline1.freeserve.co.uk/
Unfortunately because GCS is no longer produced or supported we have lost both of them to Reality Factory,I wonder if either of them have heard of this
which looks pretty cool