Dim3 is a free and open-source engine for creating 3D games. Some of the engines features include shader support, per-pixel lighting, bump, and specular mapping, real-time lighting and/or baked lighting, particles and other special effects,
skeletal animation and customization through javascript.
Projects run on OS X and Windows, editing suite is OS X only.
Join to the forum to get the current
betas, be part of the community, and keep up with
the development of version 3. Or follow this link to the code.