Info

MSE 1 mod
MSE adv 2 mods
R5 1 mod
R5 adv 2 mods
R4 1 mod
R4 adv 3 mods
R3 3 mods
R3 adv 6 mods
R2 3 mods
R2 adv 5 mods
LE Repair 2 mods
LE repair adv 3 mods
Surgical 2 mods
Surgical adv 3 mods
Probot 0
Probot adv 2 mods

What mods do

Mods allow you to do many things. They are mostly used for crafting station but can also be used for other things. Here is the list:

Food and chem, weapon and droid, structure,and Clothing and Armor Crafting station mods. There mods work the same way a personal crafting station works

There is also Medical 1-6, whice allows a medic to heal wounds outside a camp or hospital.
There is a Data 1-6 that allows the droid owner to store data from his or her data pad.
There is a Item storage. This mod is bugged right now.