D&D General What modules have you reused for multiple campaigns

I've run Keep on the Borderlands and Against the Giants for almost every campaign I've ever DMed. In my current game, the players have JUST (literally) arrived at the Steading of the Hill Giant Chief, which we are starting this Friday night.

Those two are it.

Howls in the Night, Keep on the Borderlands, Hommlet, Saltmarsh, Trouble in Threshold, Kill Bargle, Isle of Dread.

Mordent and Karameikos were lifted and dropped into my homebrew world

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Lost Caverns of Tsojicanth
Isle of Dread
Palace of the Silver Princess
Against the Cult of the Reptile God
Castle Amber
Master of the Desert Nomads + Temple of Death
Slave Pits of the Undercity
Test of the Warlords
Age of Worms (mastered 3 times with different people!)
Savage Tide
Lost Mines of Phandelver

I've run Night Below twice, Keep on the Borderlands a few times, U1-3 (The Sinister Secret of Saltmarsh series), The Temple of Elemental Evil (including Village of Hommlet), Against the Giants several times and a few of those leading into D1 - D3 and Queen of the Demonweb Pits

Necromancer Games' Tombs of Abysthor (heavily modified)
I'm also a fan of some obscure Dungeon modules that I've used a few times:
"Invisible Stalker" - really just an encounter, but with the right villain, can last an entire session. (also fairly heavily modified)
"Nightshade" - again fairly heavily modified. Sets up some great RP situations.
"Mightier than the sword" - very heavily modified. This module is so fun and unique. I ran it a convention not long ago.

Like the others, I've run Keep on the Borderlands many times, in B/X games, AD&D games, and most recently, 5e, with Goodman Games' conversion. I may even have run parts of the Return to the Keep 30th anniversary module, too. I've played it many times as well.

Sunless Citadel. Run it twice, so far. once (currently) essentially strait, and the other time heavily modified, as it was a larger group. I want to try it as a 5e adventure, now that I have that anthology.

Dragonlance Chronicles. 1-4. Both as a full adventure, and in pieces.

Ravenloft. several times, most notably, during an ice storm caused power outtage. We gathered at my friend's place, as he had heat!! A big group of us played it by candle light. Really upped the ambiance!!

I have a huge pile of printed adventures- nearly all the classic TSR era ones, plenty of 3 and 5e, and lots of third party stuff. Was a subscriber to Dungeon for years. That said, I've rarely run them or played them. We came from the design your own dungeons school. My buddy was almost entirely a homebrew adventure guy. They became infamous as "Bill dungeons"

I'm currently going through them all, sorting out the "I GOTTA run this!!!!" from the more not my cuppa ones.

And then I caught the OSR bug...

My answer here is more or less the same as it was in the other thread. I've run "Court of the Necromancers" from the Al-Qadim sourcebox Cities of Bone a few times; I love that adventure. I've run "The Portal Under the Stars" from the DCC Core Rulebook a bunch of times. I ran a few of the Primeval Thule modules (a relatively early 3PP 5e setting, also released for a few different systems) a handful of times. I've run parts of Barrowmaze for both 5e and Swords & Wizardry. I've run The Lost City a few times, and Dwellers in the Forbidden City twice.

I've reused B2 - Keep on the Borderlands for the starting area for several campaigns.
I6 - Ravenloft I've used multiple times, especially when the group gets cocky and starts thinking they're invincible (I've run it at least 5 times, the party's only been successful twice).
S2 - White Plume Mountain I've run several times; at least three, including the last time I DM'ed
I've used the Forge of Fury at least twice.

For as long as I've been playing (45? years), that's certainly not a lot, but I'm mostly using homebrew. I've run several other published adventures, but usually only once - or taken bits and pieces from them to make my own thing.

1st and 2nd edition, I have run Temple of Elemental Evil several times.
Pretty much all the 3rd edition modules from Necromancer Games I have run multiple times for 3rd and Pathfinder 1.
Shackled City adventure path I ran twice under 3rd edition and at least 3 or 4 times for Pathfinder (it's one of favourites).