DC Comics
From: https://en.wikipedia.org/wiki/List_of_DC_Comics_publications_(A%E2%80%93B)
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Action Comics
Adventure Comics
The Adventures of Bob Hope
All-American Comics
All-Star Comics
Aquaman
The Atom
Batman
* Batman '66 Meets Steed and Mrs Peel
The Brave and the Bold
Captain Carrot and His Amazing Zoo Crew
                        Constantine
* Crisis on Infinite Earths
* DC Meets Looney Tunes
Detective Comics
Doctor Fate
Doctor Mid-Nite
Flash
Flash Comics
* The Fox and the Crow
Green Lantern
* Green Lantern: Ganthet's Tale                      
* Green Lantern/Huckleberry Hound Special
Hawkgirl
Hawkman
* Hitchhiker's Guide to the Galaxy     
* The Incredible Hulk vs Superman
* The Inferior Five
* The Joker/Daffy Duck
Just Imagine Stan Lee
Justice League of America
* Legion of Super-Heroes / Bugs Bunny Special
* Lex Luthor/Porky Pig
Looney Tunes
Many Loves of Dobie Gillis
Metal Men
* Mystery in Space
* New York World's Fair Comics
xxxPeter Porkchops
Sensation Comics
Star-Spangled Comics
Starman
Showcase
Strange Adventures
* Sugar and Spike
Superboy
Supergirl
Superman
* Superman & Bugs Bunny
* Superman and Spider-Man
* Superman/Fantastic Four
* Superman/Top Cat Special
* Superman vs. The Amazing Spider-Man
Superman's Pal Jimmy Olsen
Superman's Girl Friend, Lois Lane
Wonder Woman
World's Best Comics
World's Finest

Marvel
From: https://en.wikipedia.org/wiki/Category:Marvel_Comics_titles
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* Adventure into Fear (#19 introduces Howard the Duck)
All Winners Comics
Giant-Size Man-Thing (Howard in issues 4 and 5)
* Howard the Duck
Strange Tales (#89 introduces Fin Fang Foom -- See: https://en.wikipedia.org/wiki/Fin_Fang_Foom




Fawcett Comics
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Captain Marvel (et al)
* Whiz Comics


Tower Comics
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T.H.U.N.D.E.R Agents



Other
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Magnus, Robot Fighter
* Cerebus