Ambiance

A Minecraft mod that provides realistic sound attenuation, reverberation, and absorption through blocks.

Adds dynamic lights to Minecraft as the most feature-complete and optimized dynamic lighting mod.

#listentonature

Lets you use capes from OptiFine, LabyMod and other cape mods

See farther without turning your game into a slide show

Creates ambient sounds for certain blocks during rain

A Ray tracing implementation to have Sound Physics in Minecraft. I believe this is more accurate + sounds better than Sound Physics mod.