This page lists old releases of X. For more current information, please see the releases page.
The Wikipedia page on X has some more detailed information on older releases.
X.Org Foundation monolithic releases
X.Org 6.9 (Released: 2005-12-21)
X.Org 6.8.2 (Released: 2005-02-09)
X.Org 6.8.1 (Released: 2004-09-17, patch release)
X.Org 6.8.0 (Released: 2004-09-09)
X.Org 6.7 (Released: about 2004-04-06, based on X.Org X11R6.6 and XFree86 4.4.0 RC2)
XFree86 releases
Former X11 releases, done by XFree86:
- XFree86 4.5.0 (Release: 2005-03-16)
- XFree86 4.4.99.18 (snapshot): (Release: 2004-11-27)
- XFree86 4.4.99.9 (develsnap): (Release: 2004-07-12)
- XFree86 4.4.0 (Release: 2004-02-23)
- XFree86 4.4.0 RC2 (Release: ?)
- XFree86 4.3.0 (Release: 2003-02-26)
- XFree86 4.2.1 (Release: 2002-09-03)
- XFree86 4.2.0 (Release: 2002-01-16)
- XFree86 4.1.0 (Release: 2001-06-02)
- XFree86 4.0.3 (Release: 2001-03-02)
- XFree86 4.0.2 (Release: 2000-12-15)
- XFree86 4.0.1 (Release: 2000-06-30)
- XFree86 4.0.0 (Release: 2000-02-26)
- XFree86 3.3.6 (Release: 1999-12-31)
- XFree86 3.3.5 (Release: ?)
- XFree86 2.1.1 (Release: 1994-05-04)
- XFree86 2.1 (Release: 1994-03-11)
- XFree86 2.0
(This listing might be incomplete. The provided release dates can be slightly deviating from the true release dates.)
You can find the related packages on misc mirrors.
X.Org and X Consortium
Former X11 releases, done by X.Org and the X Consortium:
X.Org X11R6.6 (Released: 2001-04-03)
X.Org X11R6.5.1 (Released: 2000-08-25)
X.Org X11R6.4 (Release: 1998-03-31)
X.Org X11R6.3 (Release: 1997-07-15)
X.Org X11R6.1 (Release: 1996-03-12)
X.Org X11R6 (Release: 1995-03-02)
X.Org X11R5 (Release: 1994-05-18)
X.Org X11R4 (Release: 1989-01-29)
X.Org X11R3 (Release: ca. 1988-10-27)
X.Org X11R2 (Release: ca. 1988-03-24)
X.Org X11R1 (Release: ca. 1987-09-18)
X.Org X10R4 (Release: ca. 1986-12-25)
X.Org X10R3 (Release: ca. 1986-06-07)
(This listing might be incomplete. The provided release dates can be slightly deviating from the true release dates.)
You can find these older versions on one of the long term of the X.Org site.