Orcrist

Orcrist was one of the best swords of the Third Age. Orcrist was said to be wielded by a mighty hero of Gondolin, it glowed blue when orcs were near (as shown in the book the Hobbit) and the blade was greatly feared by the Goblins of the world. Thorin Oakenshield wielded the blade through most of the Hobbit, when he was killed in the Battle of the Five Armies, Thranduil put Orcrist on Thorin's grave. It sat there and warned the Dwarfs when enemies were near.

Speculation
Like Glamdring, it is curious as to how Orcrist came from Beleriand to Eriador. Based on Peter Jackson's films, Orcrist appears as a curved blade, and both blades were distinguished DIFFERENTLY by Elrond when Thorin and Gandalf both presented their blades to him.

So we know that Glamdring was wielded by King Turgon, but who wielded Orcrist? There is only one elf from Gondolin who carried a curved blade, and that was Egalmoth. So in retrospect, Egalmoth could have wielded the sword and fought in the battle of Gondolin. He survived the battle and fled to the Mouths of Sirion where he was killed by the Sons of Feanor. Celebrimbor was there as well and could have taken his weapon as an heirloom to his people. So when Ost-in-edhil fell Orcrist, Glamdring, and Sting were among the artifacts plundered until they appeared in William, Tom, and Bert's cave.