Your Doom folder structure?

[ABRACADABRA]

DOOM
-chocolate
-gzdoom
-IWADS
-linuxdoom 1.10
-prboom+
-pre-release stuff (anything posted by romero and beta versions)
-wads
-zandronum
-D1SPFX15.WAD
-SPRFIX15.WAD
-fixes.txt (contains all the bugs I found so far and ways to fix 'em)
-stats.txt (contains list of level names that I complete with 100/100/100)

IWADS folder is stored in environmental viriables so no need to place every single IWAD in port's folder since they all recognize that variable

[DoomGater]

..for nostalgic reasons everything is of course in

c:\DOOMDATA\

(containing subfolder for each game / port etc.)

under Linux it's different, it depends on the used port.
I never made a unified Linux installation...:-(

[CorSair]

When I open Doom folder, I have this opening:

- IWADs
- Source ports
- WAD files (this contains all sorts of maps that don't have new items or monsters)
- Mods folder (contains folders for gameplay changing and levels that won't fit in normal WAD folder)
- Tools folder (Doom Builder, SLADE, textures, music, demos and that stuff)
- Projects folder (all my maps and stuff archived in there)
- Soundfonts folder (should move to tools)

And various frontends and launchers in their own folders litters around.

[clarry]

/d/doom/
    d1-pwad/
    d2-pwad/
    demo/
    eureka/
    iwad/
    misc-wad/
    my-wad/
    port/
        crispy/
        prboom-plus/
    unsorted/