WIP currently a straight copy of the “so you wanna play some doom” pic, V8. i know most of these are missing from the site, but it might give a good idea of things to add/remove/replace

MEGAWADS

ScytheScythe IIDoom the Way id DidDoom 2 the Way id Did
A 32 level megawad for doom2. This megawad doesn't have perfect texture alignment, insane detail and fantasticly hard gameplay. Instead it focuses on small fun maps to blast through without much thought about defense. The difficulty rises steadily as you go through the maps and the last few should challenge even the best.
This is the sequel to my old megawad “Scythe”. Expect better looking and bigger levels. Gets slaughtery as hell from MAP23 onward, beware.
More Doom than Doom! This wad aims to mimic the style of the original Doom maps. It doesn't always succeed 100%, but it ends up being a fun wad anyway, and in the end isn't that what really matters?

It spawned an expansion (Ultimate Doom the Way id Did) and a sequel (Doom 2 the Way id Did).
More Doom 2 than Doom 2 too! Like it's predecessor, DtWiD, this aims to ape the mapping styles of id Software's original mappers. It succeeds perhaps more successfully than DtWiD in that regard. The secret levels are a nice touch as well.
 
Going Downalien vendettaValiantPlutonia 2
Description
A Skillsaw megawad. Designed with pistol start in mind. Uses MBF.
«An add-on sequel for Final DOOM's “The Plutonia Experiment”. It emulates Plutonia's design and gameplay styles and follows from where it left off.» —ReadMe.txt
  
Back to Saturn X: Ep 1Back to Saturn X: Ep 21994 tune-up projectjenesis
Get Out of My Stations is the first episode of , a three-episode partial conversion for Doom II, fully compatible with original DOOM2.EXE.
Tower in the Fountain of Sparks is the second episode of , a three-episode partial conversion for Doom II, fully compatible with original DOOM2.EXE.
  
speed of doomJPCPAncient Aliens 
The Japanese Community Project was created through collaboration of more than a dozen users in the Japanese community.
A megawad by with visual stylings based on the Ancient Aliens TV program/meme and general alien conspiracies. Very colourful and includes a lot of tricky encounters.
 

LEVEL PACKS

    
equinoxepicuac ultrathunderpeak
   
ultimate torment and torturedemons of problematiquesuspended in duskPirate Doom
A partial conversion with Doomguy away on a Caribbean adventure over 18 maps with new textures, weapons and enemy reskins.
    
hellcore 2 0beyond realitye1m8be1m4b
    
impossible a new reality   
   

GAMEPLAY MODS

    
doomrl arsenalhideous destructorproject msxreelism
   
Smooth Doomaccessories to murderdoom 4 doompsychic
Smooooooooth! This wad adds frames for everything with animation in Doom. Every monster, weapon, and decoration sprite has added interpolation. Has some other optional features as well, like gore, Doom 64 weapons, etc.
    
omg weapons and monstersrussian overkillcustom doombratwurst

MULTIPLAYER MAPS

   
armageddon invasion 2duel40unidoom deathmatch xCrucified Dreams
Crucified Dreams is a 42 deathmatch-only maps megawad for Boom-compatible engines, made in the spirit of the Gothic Deathmatches series.
    
eon deathmatchdynamite deathmatchcybercrime 332 in 24 13
    
dont be a bitch remasteredigpack11  
  

MULTIPLAYER GAMEPLAY MODS

    
whodunitzdoom warshangmanicon of party
    
dodgeballjurassic riftrocket jumping xtremeinternal conflict
    
endless survivalstronghold  
  

4CHAN'S MODS

100 Minutes of /vr/200 Minutes of /vr/300 Minutes of /vr/400 Minutes of /vr/
100 Minutes of /vr/ is a collection of 13 short-sized levels, each made under a time constraint of 100 minutes, successfully delivered by our dazzling savants from /vr/ board. Who needs time when you have quality like this?
200 Minutes of /vr/ is a megawad of 33 short to medium-sized levels, each made under a time constraint of 200 minutes. It's a first /vr/'s speedmapping outing, and still a decent romp. Some fun ideas and a rough time constraint makes for a fun little megawad that won't drag on.
300 Minutes of /vr/ is a megawad of 33 short to medium-sized levels, each made under a time constraint of 300 minutes, once again assembled by the chaotic ADD-ridden cats congregation from /vr/ board. It's a second /vr/'s speedmapping release, anon really outdid himself on a lot of these.
400 Minutes of /vr/ is a megawad of 37 various-sized levels, each made under a time constraint of 400 minutes, shipped right on schedule by our splendid folks from /vr/ board. Astounding mapping crunch performance and turnover, project was factually completed over the brief course of 9 days. Striking success!
2048 Units of /vr/512 Linedefs of /vr/HFFMUnrattled
2048 Units of /vr/ is a megawad of 33 levels, each made within medium-sized confines of 2048 units and it was led by . Custom arsenal is provided in both DeHacked and Decorate forms, created by , with help from , and .

Footnote: 6 maps that did not make it to the final version are included in a separate WAD.
512 Linedefs of /vr/ is a megawad of 37 short-sized levels, each constructed with… you guessed it, 512 linedefs or less. Meticulously constructed by our exalted craftsmen from /vr/ board.
HFFM is a 19-level Boom-compatible gachimuchi inspired megawad by 's retro videogames board. Rest well in wrestle heaven, Aniki.
Unrattled is a collection of 11 levels created by the daunting boneheads of /vr/ board, now 80% marrow-free! But not quite as bare-bones as you might think.
Fore/vr/ AloneAd Mortem94 Protons of /vr//Vertex Relocation/
Born from the idea to dedicate a map to one of your favorite characters, this wad contains 23 maps referencing a fictional character (also called waifu) be it with their layout, textures, or overall theme. Aiming for Boom format with UMAPINFO and MUSINFO, maps were made using the OTEX texture set and up to 5 custom textures per map themed around the depicted character.
Ad Mortem is a /vr/ boards' own halloween-themed partial conversion led by , featuring a great variety of audio-visual assets among some spooky new maps and encounters. Sophisticated arsenal, ranging from antique firearms of bleak conflicts past to ornate occult weapons, is there to assist you striking terror back into the treacherous mass of its lurking horrors.
Prophets have once told us: that once this wad gets finally released, heavens will clasp, World War 3 will start, we shall eat nothing but bugs, aliens will come down to Earth, and Cthulhu mythos will stop being a fiction anymore. Thus it shall never be released.
33 maps built around vanilla Doom 2 enemy placement.

Mappers were allowed to change anything that isn't a monster, but were not allowed to move the enemies or modify their flags.

Despite the name, there were no restrictions on map geometry, so few (if any) vertices are shared with the original maps.
    
Deep /vr/ied Potatoburl tumdcolourful helldemonsteele
    
fractal doomgmotahdoomimpatience
  
la tailor girlpol wadSamsaraTemporal Tantrum
Ever want to play Doom as BJ Blaskowicz? No? Oh. Maybe Duke Nukem? Of course you did. Well now you can! Samsara adds 7 new playable characters from other games contemporaneous to Doom. Duke Nukem, BJ Blaskowicz, Corvus, Parias, Security Officer, Chex Quest guy, and Ranger join Doomguy to battle the fiendish minions of whatever other wad you're loading it with.

There are also add-on packs and a few forks of varying quality.
«The UAC has developed new gate technology that connects any two points in time and space. The UAC has now reported that they have lost contact with the secret facility housing the prototype gate. You have been sent to investigate. Your superiors suspect another demonic incursion. If this is what has happened, your orders are to stop the incursion by whatever means necessary.» — ReadMe.txt

HISTORICALLY NOTABLE

   
doom 64 exuac labsAll Hell is Breaking Loose!momento mori
All Hell is Breaking Loose is a classic partial conversion with a lot of fun DeHacked trickery and two-headed chaingunners. It's by , who I can only imagine had a lot of fun making it.
   
Dwango5zen dynamicsaliens tcimmoral conduct
It's back again, another frag-filled compilation of the nation's best deathmatch WADS. With input from various parts of the country, this WAD contains 24 more of the best, most exciting and most played levels for multiplayer games. With new music ranging from Nine Inch Nails to Two Unlimited, I've added the best sounds to further enhance your gaming experience!

All credit goes to the original authors of all 24 levels. Some levels were taken from other compilations, so I may not have the actual original filenames. However, the only credit I will take is for the time to organize the levels and adding the new graphics and music.

Nothing contained in this WAD expresses the views or opinions of IVS/DWANGO. This WAD has been released by an individual and is in no form an official publication from IVS/DWANGO.

    
nj doomassault on tei tenganutsmordeth
   
Origwaddoomsday of uac  
The first known user made pwad. Made without a proper level editor, it's two rooms of future promise.
  

TOTAL CONVERSIONS

   
Action Doom 2harmonystrange aeonsadventures of square
Original version of Action Doom 2. A romping fun beat-em-up game for ZDoom, made by . Claw your way to the top of the criminal world to save your kidnapped daughter, and beat down seemingly every single bad guy in the city along the way. Wears it's influences on it's sleeve, but has it's own style. Prequel to the original Action Doom.

External link is for the 2021 version, which features some cool updates, and some censored content. Local link is the original 2008 version, plus bonus maps and expansion pack.
    
shadow of the wool ballparanoidnido forcehocus doom
  
mayhem mansionREKKRMega Man 8-Bit DM 
REKKR is a full four-episode total conversion for the Ultimate Doom set in a faux-norse/celtic fantasy world overrun by monsters. Made within vanilla limits and assistance of DeHackEd.
Zandronum-based total conversion. Contains a vast amount of multiplayer deathmatch arenas, weapons, items, and skins based on the original series of Mega Man games.

Installer comes with it's own launcher, stable Zandronum, Doomseeker set up for it, and can optionally make clickable server links able to launch the game and join in easily.