O3D
Octane
Oculus
Object-oriented programming
OBJ
Occlusion Culling
Odometry
Onion skinning
Onlinemarketing
Online Publishing
Open Graphics Rendering Engine (OGRE)
Open GL
Open Handset Alliance
Open Source
OpenEXR
OpenGL ES
Openglide
OpenML
OpenSCAD
Openshot
OpenVG
OptiX
Oracle Corporation
Overhead
OVI
