1) There are several "magical" swords in the story of Beowulf: Hrunting (although mainly ceremonial.. but it is named specifically). An un-named "giant" sword he finds, but leaves in the lair he finds it. And last, a third ceremonial sword with a specific name Naegling.
2) Three from Greek Myth off the top of my head:
Cronus (Saturn in Rome) had a sickle made by Gaia which was meant to cut through anything.
Zeus' lightning bolts, crafted by Hephaestus I believe? Hephaestus also made Eros' (Cupid for the Romans in the crowd) bow and arrows.
Poseidon's trident. Not 100% if it was magical or what he did with it exactly.
3) There is King Solomon's "Emeral Sword" in Persian myth. It was like a bane weapon and the only one that could kill a demon. I forget the whole story...
4) In Arthurian myth, Excalibur is Arthurs' Sword of War. Clarent is another sword, The Sword of Peace.
5) What about Thor's Thunderhammer? I'm not too sharp on Norse Myth or anything...