~Classic~
The Classic Artifacts are the original 16 artifacts found in Arena and 15 of them made reappearances through-out the TES games, though only two appeared in all five main games. (A lot of them had appear in four games and the rest only in three games). The 16th artifact, from my knowledge, never made a reappearance, unless I just hadn't found it yet in Daggerfall.
~Daedric~
These would be artifacts created by Daedric Princes. (Due to all 20 spots being filled, some minor or less-used Daedric Artifacts have been moved to the "Other Section").
~Dwemer~
These are the artifacts with Dwemer origin. (I also considered Spellbreaker in this area even though it's origin is unknown and that Peryite tends to have it).
~Legendary~
These artifacts are legendary ones created by either a Divine being or an extremely powerful individual.
~Other~
This area is to cover minor artifacts or artifacts which cannot fit in their normal area (due the list being full). Also, artifacts ONLY mentioned in lore would be in this area as well.
~Any I miss?~
If I missed any artifact (which I know I've had) then please tell me so and I'll put them on the right list. I just didn't had enough time to go through everything before posting this...