I just released the game engine
CopperCube in version 5.2 as free update. Besides other features, it includes the announced water surface rendering, which I managed to make work on all supported platforms: Windows (D3D and OpenGL), Mac OS X, WebGL, Android, and even Flash. It looks nicely on all of these, here are some examples:

It looks much nicer in movement, of course. If you want to see it in action, you can try it directly on a website, I created a small demo with two different scenes:
WebGL Water rendering demo. It works surprisingly fast, and also does look nicely.
I'm very happy about this release. It also includes a lot of other changes (
detailed list here), like localization. Meaning the editor user interface now also works with different languages. I already added a german translation, and planning to add some more later.
Hope you like this release!