Okino's PolyTrans can convert most major 3D file formats into OpenGL C code.
Demos are available on their Web site.
3DWinOGL is shareware that reads in any file format and returns OpenGL primitive data. The XGL file format is intended to be capable of storing all OpenGL 3D information. An open source parser and a 3DS file converter are available. The file glm.c contains routines for reading in Wavefront OBJ files. A 3DS import library in Delphi designed for use with OpenGL can be found here.