Version 1.8.9-1.1.0:

ADDED: Yellowjacket & Wasp
ADDED: Armor abilties! Comes with slight change in shrinking. (e.g. Normal AntMan can't grow anymore)
ADDED: Regulator GUI. You can put in the regulator item, the discs or you can let it empty. (Default button: B)
ADDED: Size Regulator GUI in Civil War AntMan suit. It let's you choose how tall you want to be
ADDED: Quantum Realm! Leave the slot in the regulator GUI empty to enter it. It contains block with rare stuff in it.
ADDED: Mobs sound pitch changes with size
ADDED: Creeper explosions are equal to their size
ADDED: Some new config options
CHANGED: Only one button for size-changing.
CHANGED: The size-change-effects will only appear when you play with fancy graphics
CHANGED: The HUD color/regulator depends on your suit
FIXED: Changed position when you change your size to stay in the center of the hitbox (I hope that sounds understandable)
FIXED: Size will updated correctly after rejoining a world/server
FIXED: Damage bug (this time it's really fixed)
FIXED: Other players render correctly when they are sneaking

PymTech (Legacy)

AntMan-Beta-1.7.10-1.0.0.jar