Ack! I probably should mention what my engine uses, since people may very well be using these for their own C++ projects:

• Ogre 3D – Graphics
• Bullet – Physics
• OIS – Input
• OpenAL – Sound
• OGG/Vorbis – Ogg support
• DUMB – MOD/XM support
• FreeType – Font rendering
• zLib – archiving
• Polyvox – Voxels (probably not for LD)
• wxWidgets – IDE (won’t be present in the exe being distributed)

Half an hour left and I’m cramming to add a few extra features. With the possibility of Jams being rated, I may very well be working with NeonLare on a project together, as he’s been my right-hand man on a lot of dev work.