Age of Apocalypse

X-Men Ashcan (1995)

Age of Apocalypse: The Chosen (1995)

Amazing X-Men (1995)

Astonishing X-Men (I) (1995)
Factor X (1995)
Gambit and the X-Ternals (1995)
Generation Next (1995)
Weapon X (I) (1995)

X-Calibre (1995)
X-Man (1995-2001)
X-Men Alpha (1995)
X-Men Chronicles (1995)
X-Men Omega (1995)
X-Universe (1995)
Tales of Age of Apocalypse: By the Light (1996)
Tales from the Age of Apocalypse: Sinister Bloodlines (1997)
Blink (2001)
The Official Handbook of the Marvel Universe: X-Men Age of Apocalypse 2005 (2005)
X-Men: Age of Apocalypse (2005)
X-Men: Age of Apocalypse One Shot (2005)

What if? X-Men Age of Apocalypse (2007)

Age of Apocalypse (I) (2012-2013)

Age of Apocalypse (II) (2015)

Reprints:

Exiles TPB (I) vol.10: Age of Apocalypse (2005)

X-Men TPB: The Complete Age of Apocalypse (2005-2007)

X-Men TPB: The New Age of Apocalypse (2005-2007)

X-Men vs. Apocalypse TPB vol.2: Ages of Apocalypse (2008)

X-Men TPB: Age of Apocalypse Prelude (2011)

Age of Apocalypse TPB vol.1: The X-Terminated (2012)

X-Men Omnibus (HC): Age of Apocalypse (2012)

Age of Apocalypse TPB vol.2: Weapon Omega (2013)

X-Men: Age of Apocalypse Omnibus Companion (HC) (2014)

True Believers: Age of Apocalypse (2015)

X-Men TPB: Age of Apocalypse vol.1: Alpha (2015)

X-Men TPB: Age of Apocalypse vol.2: Reign (2015)

Age of Apocalypse: Warzones! TPB (2016)

X-Men TPB: Age of Apocalypse vol.3: Omega (2016)

X-Men TPB: Age of Apocalypse vol.4: Dawn (2016)

X-Men TPB: Age of Apocalypse Twilight (2016)

X-Men TPB: Age of Apocalypse - Termination (2018)

See also:
Apocalypse (En Sabah Nur) series

Blink (Clarice Ferguson) as member of the Exiles (III)

Dark Beast (Henry McCoy) as member of the Dark X-Men

Holocaust as member of the Exiles (III)

Nightcrawler (Kurt Wagner) as member of X-Force

Sabretooth (Victor Creed) as member of the Exiles (III), New Exiles

X-Man (Nate Grey) as member of the New Mutants