OpenGL and OpenGL ES Tessellator

Tessellators and Quadrics
Polygon Tessellation In OpenGL
OpenGL Tessellation

GLU ES for OpenGL ES 1.x (for Win32)

iGLU: GLU for OpenGL ES 1.1 (for iPhone)
gluTessellator on iPhone

Using 3D models on iPhone

iPhone SDK mesh COLLADA import

OSG new release supporting OpenGL ES

OSG on iPhone
OSG for iPhone support isn't still released (by Robert Osfield, Mar 1st 2010). But, we can try to use above changes by Thomas Holgarth.