PalmBay by Painkiller
It's a great FPS demo including source code and a compiled version, the one which also appears on Gamestudio's promo video.
Sorcerers by Pavle Nikolic
A barbarian fortress, with the example level consisting only of mdl files with external textures.
Road Tool by Thorsten Petersen
RoadTool GS allows you to build smoothed roads and rails for your game at runtime. Press 0 to unlock the camera and move arround with WASD or the mouse. Press left mouse button to set a waypoint. Press and hold the left mouse button to move the added waypoint.
While you are moving a waypoint you can change the height using the mouse wheel. Press R to spawn a car which is moving along the created road. To close a road set the last waypoint near the first waypoint.
