Crafting in The Foundry:

This wear you can craft any blueprints or parts you find or buy.

Items such as:
Waframes
Weapons
Archwing
Companions
Landing craft
Cosmetics
Gear items
Keys
Craftable parts
Fishing
Mining
Everything else is under the miscellany tab.

Crafting in the foundry uses your raw resources that you obtain while playing aswell as a credit cost.