Luke3D

Eventually, this will become a SIMPLE game environment. For the time being, though, it is little more than a basic modelling tool being developed by a high schooler. It's only a few weeks into development right now, but it's being updated all the time.

Instructions for use:
Rotate in X-axis: Hold left-mouse button and move the mouse
Rotate in Y-axis: Hold middle-mouse button and move the mouse
Rotate in Z-axis: Hold right-mouse button and move the mouse
Select a point: Double-click it
Select multiple points: Hold CTRL and select points
Extrude: Select at least one face and press the up arrow or the down arrow
Translate a point/points: Select them, hold down X, Y, or Z to specify axis, and then press the left or right arrow
Subdivide: Select at least one face and press S
View top: Press 7 on numpad
View front: Press 1 on numpad
View side: Press 3 on numpad