Mod content is unrated and may not be appropriate for all ages.
MechWarrior 5: Mercenaries Standard Edition
HarJel I, II, III
Self-Repair systems. Upon taking damage they will repair armor and structure in their install location for a certain amount of time. Also they add a 1.1. armor multiplier to their install location. Install a total of 7 HarJel systems to make the entire mech self-repair. Different HarJel tiers cannot be combined, also they cannot be installed in the head (lore forbids it!).
Patchwork T1 - T3
provide a small amount of weight in exchange for some slots. Because Patchwork is awesome.
Modular Armor Mk1 - Mk4
Armor upgrades which add a fixed amount of armor to their installation location. Variants for rear armor are included.
Black Carapace
Find it, cower in its presence.
Advanced Targetting Computers
TC upgrades which weigh a ton but add considerable upgrades for different weapon systems.
Additional Armor and Structure upgrades
Composite Structure - Half weight but also half the structure points
Endo-Composite Structure - 0.75 of the weight but with some bulk
Heavy Ferro Armor - 24% more armor for 21 dynamic fillers