pyTile

Isometric engine for a future transport sim game (think Simutrans, or Transport Tycoon)

Controls:
Right-click and drag to move the screen
"h" - selects terrain modification mode
    Left click and drag to raise/lower a tile.
    "s" - toggles smooth terrain modification
    "i","o","k","l" - change size of modifier tool
"t" - toggles track-drawing mode
    Left click to place track start point, click again to place track end point

That's all it does so far.