There are fourteen books in the series, all of which continue the same story, weaving towards the ultimate climax. Books 12 through 14 were completed by fantasy author Brandon Sanderson, who was chosen by Robert Jordan's widow after he passed away. Robert Jordan left behind an abundance of notes and audio recordings, which allowed his family and Mr. Sanderson to tie up the series in a way that very closely matches his original vision.

Main Sequence Novels
The Eye of the World - originally published in 1990
The Great Hunt - originally published in 1990
The Dragon Reborn - originally published in 1991
The Shadow Rising - originally published in 1992
The Fires of Heaven - originally published in 1993
Lord of Chaos - originally published in 1994
A Crown of Swords - originally published in 1996
The Path of Daggers - originally published in 1998
Winter's Heart - originally published in 2000
The Crossroads of Twilight - originally published in 2003
Knife of Dreams - originally published in 2005
The Gathering Storm - with Brandon Sanderson. Originally published in 2009
Towers of Midnight - with Brandon Sanderson. Originally published in 2010
A Memory of Light - with Brandon Sanderson. Originally published in 2013

Other related works
New Spring: The Novel - originally published in 2004

source : http://www.dragonmount.com/Books/index.php