anyone here can point me to an opengl viewer for blender files ?
what exactly do you need?
blender IS an opengl-“viewer” for .blend - files
as far as I know, the whole interface is opengl
if you want a program to display blender model in grey-shaded view, why not just use blender and disable the ground planes and maximize the window?
hmm could you use the game engine to create something like that?