If you like marching cubes in WebGL, here are some more examples (both CPU and GPU based implementations):

http://threejs.org/examples/webgl_marchingcubes.html

http://webglsamples.org/blob/blob.html

http://webglsamples.org/caves/caves.html

https://www.clicktorelease.com/code/bumpy-metaballs/

http://dev.miaumiau.cat/rayTracer/

http://dev.miaumiau.cat/sph/

http://mikolalysenko.github.io/Isosurface/

Is Marching Cubes not already outdated algorithm to do this !?

Why not use state pf the art algorithm for this, like Marching Tiles ?

For few other approaches implemented for WebGL see here:

http://0fps.net/2012/07/12/smooth-voxel-terrain-part-2/

Marching cubes is 3d isosurface reconstruction, and recently it has become un-patent encumbered, so there's a new rennaisance of usage.

From my google searches, all I can find on "Marching tiles" is a bunch of 2d stuff. Hardly state of the art...

Can you direct me to what you meant when you said state of the art?