ArmorMovementMod by JSut210
This mod adds some advanced armors like parachute boots and helmets
armor
ArmorStatusHUD by bspkrs
ArmorStatusHUD is a client mod that shows your armor and held item stats on the HUD.
clientside HUD armor pvp opensource
Enderium Power Armor by tterrag
opensource armor tech
MachineMuse's Modular Powersuits by MachineMuse
A mod which adds modular power armor, power tool, and a tinker table to configure them. Uses UniversalElectricty or IC2 for energy.
armor tech survival
Simply Jetpacks by tonius11
A mod that adds jetpacks that work on Redstone Flux, and only that.
addon armor tech