The Official Zelda Website 

Also, here is a list of the sites for each individual game:

The Legend Of Zelda (The first one)
link

The Adventure Of Link
link

A Link To The Past
link

Link's Awakening
link

Ocarina Of Time
link

Master Quest
link

Majora's Mask
link

Oracle Of Ages
link

Oracle Of Seasons
link

Fourswords
link

The Wind Waker
link

Fourswords Adventure
link

The Minish Cap
link

Twilight Princess
link

Phantom Hourglass
link