Corosus

Lets you see if players are typing, in a GUI, idle, with cool ingame visuals

Can drastically improve frame rates by limiting how far away tile entities and entities can render, with configurable ranges.

Optimizes a lot of tasks that Entity AI wastefully performs, minimal effect on gameplay.

Smarter more aware zombies (and others), they track you down via blood scent, sound, and light source awareness

Adds storms, tornadoes, wind, lots of particle effects and more.

Shared library mod for Corosus's mods