wxSand

Features:
– Explosions! (2 kinds)
– Energy transfer, sandbox temperature
– Load/Save
– Turn boundary walls on/off
– Turn sources on/off
– Many Elements
– Select area size: 320×240 – 1280×1024
– Save/load/modify/add elements and physics
– Up to 200 elements
– Use less than 100% CPU on limited FPS mode.
– Group or hide elements