I just finished another 3D project: a clone of Shamus Young's Pixel City.
It is written in Dart and uses Raymond Hulha's excellent ChronosGL library.
Try it out at http://art.muth.org/pixelcity.html
Note: due to a bug in (the way I use) Dart this does not appear to be working on Firefox currently, so use Chrome for now.
Several variants are accessible from the Config Screen - press "C" to enter it.