Can anybody list all the unique swords like, chillrend, dawnbreaker etc. Or redirect me to a site where I can find all of them. I have just wanted to get a collection and have them all on show but I don't know all of them.

http://www.uesp.net/wiki/Skyrim:Artifacts

Has more than swords, but should serve you well.

Hmmm:
-Dawnbreaker
-Chillrend
-Nightingale Sword
-Blade of Woe [Actually it counts as dagger]
-Ghost Blade
-Dragonbane [It's uniquie enchanted]

I don't remember more at now.