These are a few of my favorite things...

We've been having some fun discussion on G+ about favorite old-school and new old-school/OSR titles, and I in it pulled out part of my list of favorite RPG books:  adventures, supplements, rules sets, campaigns I'd most like to run, etc.  I didn't put all of that into the G+ thread (it wasn't all relevant), but I've been evolving (and reformatting...) the list over time, and thought it would be worth sharing here.

So without further ado!:

My favorite RPG adventure/module ever is Masks of Nyarlathotep for Call of Cthulhu.

The longer answer:

My favorite D&D adventures of all time (roughly in order):

1.  G3 Hall of the Fire Giant King by Gary Gygax (D&D; TSR)
2. Maure Castle (Paizo)/WG5 Mordenkainen's Fantastic Adventure by Rob Kuntz (AD&D; TSR)
3. T1 Village of Hommlet by Gary Gygax (AD&D; TSR)
4. A1 Slave Pits of the Undercity by David Cook (AD&D; TSR)
5. Maze of Zayene #4 Eight Kings by Rob Kuntz (AD&D from Creations Unlimited, or d20 from Different Worlds)
6. WG4 Forgotten Temple of Tharizdun by Gary Gygax (AD&D; TSR)
7. Dark Druids by Rob Kuntz (1e/Guy Fullerton's Chaotic Henchmen)
8. D3 Vault of the Drow by Gary Gygax (AD&D; TSR)
9. Starstone by Paul Vernon (OD&D; Northern Sages)
10. S4 Lost Caverns of Tsojcanth by Gary Gygax (AD&D; TSR)
11. Caverns of Thracia by Jennell Jaquays (D&D; Judges Guild)
12. Return of the Eight by Roger E. Moore (AD&D 2nd edition; TSR)
13. Tomb of Abysthor by Clark Peterson and Bill Webb (d20; Necromancer Games)
14. "Treasure of the Dragon Queen" by Rutgers University Gamers (D&D convention tourney c. 1983; Rutgers University Gamers; details on my site @ http://www.greyhawkonline.com/grodog/gh_tourneys_dragon_queen.html)

Honorable Mentions for D&D adventures (in no particular order):

• Maze of Zayene #1 Prisoners of the Maze by Rob Kuntz (AD&D from Creations Unlimited, or d20 from Necromancer Games)
• D1 Descent into the Depths of the Earth by Gary Gygax (D&D; TSR)
• The Lost Abbey of Calthonwey by Bob Charette (AD&D; Phoenix Games)
• Castle Zagyg: Dark Chateau by Rob Kuntz (d20; Troll Lord Games)
• Beastmaker Mountain by Bill Fawcett (AD&D; Mayfair Games)
• R1 To the Aid of Falx by Frank Mentzer (AD&D; TSR)
• Crucible of Freya by Clark Peterson and Bill Webb (d20; Necromancer Games)
• CH12 Seren Ironhand by Tom Moldvay (AD&D; Challenges), as well as the two other modules in the Morandir series CH-1 The Morandir Company and CH-3 The Mountain King)
• B1 In Search of the Unknown by Mike Carr (D&D; TSR)
• B4 The Lost City by Tom Moldvay (D&D; TSR)
• X2 Castle Amber by Tom Moldvay (D&D; TSR)
• X4 Master of the Desert Nomads by David Cook (D&D; TSR)
• X5 Temple of Death by David Cook (D&D; TSR)
• N1 Against the Cult of the Reptile God by Douglas Niles (AD&D; TSR)
• WG6 Isle of the Ape by Gary Gygax (AD&D; TSR)
• N5 Under Illefarn by Steve Perrin (AD&D; TSR)
• Three Days to Kill by John Tynes (d20; Atlas Games)
• Demons & Devils by Bill Webb and Clark Peterson (d20; Necromancer Games)
• The Abduction of Good King Despot by Will and Schar Niebling (AD&D; New Infinities Productions)
• The Original Bottle City by Rob Kuntz (AD&D from Black Blade Publishing in 2014, OD&D from Pied Piper Publishing in 2007)

My favorite adventures of all time, for any system, are, in alphabetic order:

• Angmar: Land of the Witch King (MERP; ICE)
• Broken Covenant of Calebais (Ars Magica; Lion Rampant)
• Caverns of Thracia (D&D; Judges Guild)
• The Court of Ardor (MERP; ICE)
• "Deep Sh*t" (Blue Planet convention tourney; Biohazard Games)
• The Enemy Within campaign (Warhammer FRP; Games Workshop):  
• The Enemy Within (1986) by Jim Bambra, Phil Gallagher, and Graeme Davis
• Shadows Over Bögenhafen (1987) by Davis, Bambra, and Gallagher
• Death on the Reik (1987) by Gallagher, Bambra, and Davis
• Power Behind the Throne (1988) by Carl Sargent
• Something Rotten in Kislev (1989) by Ken Rolston with Graeme Davis
• Empire in Flames (1989) by Sargent
• G3 Hall of the Fire Giant King (D&D; TSR)
• "Grace Under Pressure" (Call of Cthulhu; Pagan Publishing)
• Griffin Mountain (Runequest; Chaosium)
• "In Media Res" (Call of Cthulhu; Pagan Publishing)
• Masks of Nyarlathotep (Call of Cthulhu; Chaosium)
• Shadows of Yog-Sothoth (Call of Cthulhu; Chaosium)
• T1 Village of Hommlet (AD&D; TSR)
• Tomb of Abysthor (d20; Necromancer Games)
• "Treasure of the Dragon Queen" (D&D convention tourney c. 1983; Rutgers University Gamers; details on my site @ http://www.greyhawkonline.com/grodog/gh_tourneys_dragon_queen.html)
• Walker in the Wastes (Call of Cthulhu; Pagan Publishing)
• WG5 Mordenkainen's Fantastic Adventure (AD&D; TSR) and the "Maure Castle" series (d20 in Dungeon; Paizo)
• Yellow Clearance Black Box Blues (Paranoia; West End Games)

My favorite supplements of all time are, in alphabetical order:

• Big Rubble (Runequest; Chaosium)
• Chessboards: The Planes of Possibility (generic D&D; WotC)
• Cities 2nd edition (generic D&D; Midkemia Press)
• Delta Green (Call of Cthulhu; Pagan Publishing)
• Different Worlds Magazine (1979-1986; Chaosium)
• Dragon Magazine Archive (D&D; WotC)
• Dungeon Magazine 1986 to present (TSR, WotC, Paizo)
• Faeries (Ars Magica; Lion Rampant)
• GURPS: Illuminati (GURPS; Steve Jackson Games)
• GURPS: Russia (GURPS; Steve Jackson Games)
• Order of Hermes (Ars Magica; Lion Rampant)
• The Primal Order (generic D&D; WotC)
• Thieves World box set (multiple systems; Chaosium)
• World of Greyhawk box set (AD&D; TSR)

My favorite city-based supplements and adventures of all time are (in no particular order):

• Gabor Lux's settlements from Echoes from Fomalhaut contain many city/settlement adventures: http://beyondfomalhaut.blogspot.com/
• Lankhmar City of Adventure (TSR)
• Thieves World (Chaosium, boxed set and Thieves World Companion booklet; FASA also published four TW adventures, including the rare Blue Camel at https://web.archive.org/web/20071013122156/http://www.thievesworld.info/roleplay/bluecamel.htm)
• The Free City of Haven (plus supplements, by Gamelords; various Thieves Guild materials would also fit in nicely; see http://diffworlds.com/gamelords_thieves_guild.htm and http://diffworlds.com/haven.htm)
• Cities, Tulan, Carse, Towns of the Outlands (Mikdemia Press but Cities, Tulan, and Carse were also reprinted by Chaosium)
• Bard's Gate (Necromancer Games)
• Marienburg and Warharmmer City (Games Workshop)
• FR1 Waterdeep
• Citybook series (Blade/Flying Buffalo)
• "Barnacus: City in Peril" (Dragon Magazine #80; pairs up nicely with "Can Seapoint be Saved?" too)
• Greyhawk: The Adventure Begins (WotC; using Denis Tetreault's map from the Living Greyhawk Journal #2 at http://melkot.com/locations/cogh/cogh.html)
• Pavis and Big Rubble (Chaosium)
• Irillian (White Dwarf 42-47)
• Tarracina Port (by Kent Krumvieda/Dreamborn at http://www.dreamborn.com/p_tport.html; also has two modules set in the city)

My favorite RPGs/core rule books of all time are:

• Amber Diceless (Phage Press)
• Ars Magica, 5th edition (Atlas Games)
• Blue Planet, 1st edition (Biohazard Games)
• Call of Cthulhu 5th edition (Chaosium)
• Dune: Chronicles of the Imperium (Last Unicorn/WotC)
• Dungeon Masters Guide, third edition revised printing (AD&D 1e; TSR)
• Eclipse Phase (Posthuman Studios)
• Fading Suns, 2nd edition (Holistic Design)
• Kult, 1st edition (Metropolis Ltd.)
• Paranoia, 2nd edition (West End Games)
• Star Wars, 2nd edition Revised and Expanded (West End Games)
• Vampire: The Masquerade, 1st edition (White Wolf)

I'll follow-up this post with favorites from Dungeon Magazine and other zines, and campaigns I'd like to run or play in next, and perhaps get a few more of my historical reviews republished to my web site RPG reviews section, too.  We'll see....

Allan.