A while back I made a guide about chests and how to farm them. I have extended that quite a bit and made a complete Item List. Items of every type (weapons, orbs, shields, armor, rings, spells, runes, plans and miscellaneous) are listed, with all the possible instances where the item can be found, as well as the stats you see in-game.
This will be my definitive take on all of this, since the previous guide was more incomplete than I thought and, well, it only covered items you would find in chests. This new list covers quest rewards, merchants, chests, enemies and other sources.
More details can be found on the guide itself: