I like Ars Metallica for this aswell
Best thing about being able to smelt down the metal from all those daggers ..
Ars Metallica increases your Smithing skill from using smelters too, so even the process of recycling resources from items you do not need / making ingots from ore is beneficial to the skill.
Edit : You will probably do it anyway at some point but Leo's warning about not smelting down something valuable .. I crafted a really nice bow up to legendary once and forgot to read what smelting a particular resource would be taking that resource from - Click gone
( Did not realise until quite a few hours gameplay later, and I was keeping saves to a minimum at the time, re-using three slots )
It also adds the need to have crafting feathers to make arrows, and quite a few other nice additions to the immersion of crafting.