Top Ten Weapons in Middle Earth Lore

Anything from the Silmarillion is awesome, swords included.

Its name is Sindarin for "Foe-Hammer". Also called "Beater" by orcs, this sword was originally forged for Turgon, the King of Gondolin. But it is best known as the sword Gandalf wielded during the War of the Ring. In Tolkien's writings, Glamdring's color when glowing is always described as white. The sword is inscribed with runes in the Elven language. In the movies the runes say, "Turgon Aran Gondolin, Tortha gar a matha Glamdring, Vegil Glamdring good daelo. Dam an Glamhoth." which translates to "Turgon, King of Gondolin, wields, has, and holds the sword Glamdring, Foe of Morgoth's realm, Hammer of the Orcs."

It can summon fire.

Sting was an Elven shortsword made in Gondolin during the First Age. Sting was like Glamdring and Orcrist in that "being the work of Elvish smiths in the Elder Days, these swords shone with a cold light if any Orcs were near at hand." But only Sting was definitively described as glowing blue, or glittering with blue flame at its edges. After wielding it during the Quest for Erebor, Bilbo Baggins had it engraved with the Sindarin text, "Maegnas aen estar nin dagnir in yngyl I'm". Translated into English, it reads, "Sting is my name; I am the spider's bane."

The name Orcrist means "Goblin-cleaver", from "Orc" and the Sindarin "ris" ("to cut"). The Orcs also called it "Biter". Orcrist, along with Glamdring its "mate", are described in The Hobbit as having "...beautiful scabbards and Jeweled hilts." The sword is said to have "killed hundreds of goblins in its time." The sword's original wielder is never stated in any of Tolkien's writings. However, it is widely speculated that one of the Lords of the Gondolindrim was the wielder of Orcrist. In particular, Ecthelion of the Fountain led a charge and killed countless Orcs with his sword. The fact that the Orcs of the Misty Mountains feared Orcrist, may be attributed to this.
Orcrist became the sword of Thorin Oakenshield during The Quest for Erebor. Upon his death, the sword was placed upon Thorin's tomb under the Lonely Mountain, and it "gleamed ever in the dark if foes approached".

Oh, wow, you're right. How could I forget to add this? I was thinking more physical weapons than pure magical.

Morgul-blades, also called "Morgul-knives", were magical and poisonous daggers that were used by the Ringwraiths during the Third Age. After having tasted flesh, the dagger breaks, leaving a shard of the blade in its victim. The remaining blade soon turns to dust, and the shard works its way through the body to the heart. If the shard of the blade stays in the victim for too long, the victim becomes a wraith.
In Frodo's case, Elrond was able to remove the shard and heal the wound, but each year on the anniversary of receiving the wound from the Morgul-blade, Frodo became seriously ill. Only his eventual departure to the Undying Lands offered a permanent cure.

The blade disappears and is left in the victims body. It is beast