ObjMode is a major mode for editing Wavefront 3D obj ascii files. I has simple syntax highlighting, Imenu support, and movement-by-defun and paragraph (object/group blocks).
Download: https://raw.github.com/abend/obj-mode/master/obj-mode.el
Git repo: https://github.com/abend/obj-mode
Installation:
Put obj-mode.el in your load-path and add the following line to the .emacs file:
(require 'obj-mode)