Weapon wads

[Ace]

What are some good weapon wads to fool around with? Links are appreciated too.

[Sundown]

You should try both insanweps.wad and insanmons.wad
It adds a decent amount of custom monsters and weapons. If you want to play these mods, load insanweps FIRST, then insanmons or else it won't work.
It requires Skulltag actors and data. Some enemies are invisible if you play the Ultimate Doom because there are Doom 2 actors.

[Ivan]

Try "Death & Decay" by me.

[Combinebobnt]

try out complex doom if you get bored of dnd

[Empyre]

Here are some over-the-top over-powered weapons. They achieve that power in more interesting ways than just shooting fast. OPWeapons
Here are some mods that you can use to try to give the monsters a sporting chance. 10x and Vile Curse variants (Note: They still have no chance.)

[Sundown]

If you want a good randomizer that has a lot of monsters and guns (I don't prefer AEOD because I can't even load it on Zandro/GZDoom), try Scalliano's Shuffle 667 mod, zmwr.pk3 :) It needs a patch if you want to play the Ultimate Doom, zudmwr.pk3. Lastly, if you loved PSX Doom TC, then grab yourself zpsxmwr.pk3. You will love it! (Or not lol depends on your taste)
Another recommendation would be 100gunsxv24b.pk3. I'd say it has some OP weapons in there too. You're welcome :)