I always imagined the Witch-King to carry a mace without a chain, like this one:
Anyway, there are plenty of LotR weapons...and even more, if you count the Silmarillion/Hobbit ones.
Narsil - Elendil's Sword
Anduril - The name Narsil got after it was reforged.
Aiglos - Spear of Gil-Galad
Sting - Frodo/Bilbo's Sword
Glamdring - Gandalf/Turgon's Sword
(Movie-Only) Hadhafang - Elrond/Arwen's Sword
Gurthang- Turin's Sword
Orcrist - Thorin's Sword
...are the ones I remember from memory. There're probably lots more.