Illumination
mt-mods

Causes players to emit light while holding any luminescent item.

Fire Plus
LandarVargan

Allows players to be lit on fire.

Slimes inspired by TheManaWorld
Piezo_

Adds several types of slimes inspired by TheManaWorld

Temperature Survive
AiTechEye

Makes you feel temperatures

Ocular Networks
PolySaken

Draw power from the world, and use it to power machines and tools.