Coincidence: Marvel Two-in-One Annual #2 / Batman - Superman #6

Title: Marvel Two-in-One Annual #2	Title: Batman - Superman #6
Publisher: Marvel Comics	Publisher: DC Comics
Cover date: 1977	Cover date: 2013
Artist: Jim Starlin	Artist: Brett Booth

Homage: Marvel Two-In-One Annual #2 / New Avengers v3 #12

Title: Marvel Two-In-One Annual #2	Title: New Avengers v3 #12
Publisher: Marvel Comics	Publisher: Marvel Comics
Cover date: 1977	Cover date: 2013
Artist: Jim Starlin	Artist: Mike Deodato Jr.

Captain Marvel v1 #29 Homages

Title: Captain Marvel v1 #29	Title: Charlton Bullseye #2 (interior page)
Publisher: Marvel Comics	Publisher: Charlton Comics
Cover date: 1973	Cover date: 1975
Artist: Jim Starlin	Artist: Jim Starlin

Title: The Life of Captain Marvel #1	Title: Civil War: The Return
Publisher: Marvel Comics	Publisher: Marvel Comics
Cover date: 1985	Cover date: 2007
Artist: Jim Starlin	Artist: Ed McGuinness

Title: Captain Marvel v6 #1
Publisher: Marvel Comics
Cover date: 2012
Artist: Adi Granov

The Captain Atom page was spotted at Rip Jagger's Dojo. Also, you can see the cover before the John Romita redrawing here.

The Starlin Melee

Title: Dreadstar #1	Title: Breed III #6
Publisher: Epic Comics	Publisher: Image Comics
Cover date: 1982	Cover date: 2011
Artist: Jim Starlin	Artist: Jim Starlin

Title: Unity 2000 #1	Title: Strange Adventures v3 #4
Publisher: Acclaim Comics	Publisher: DC Comics
Cover date: 1999	Cover date: 2009
Artist: Jim Starlin	Artist: Jim Starlin