Slowly merging the generators of D&D into one mega-guide. starting with Dungeons..
Traps, doors and encounters among the generators for creating dungeons for 5th edition Dungeons and Dragons.
Disclaimer. I'm an affiliate for DM's Guild and I also create a lot of products with random tables on DM's Guild..
5th Edition is the most recent version of the most popular roleplaying game in the world.
And here are many generators for it.
Dungeon PDFs at DM's Guild
If you like random tables in pdf format then the DM's Guild has a few choices.
The Random Dungeon Room Generator has rooms and chambers covered.
For more on doors you can try Deadly Dungeon Doors with tables including wooden, exotic, door traps and oddities
A Pay What You Want resource for low-level dungeons is Random Encounters: Dungeon Levels 1-3
5E has DM's Guild and on there you can find tables with Loot and Fortune with tables for mundane and different monster types.
Starting off is a generator using the tables from the Dungeon Master's Guide at Chartopia. It has filters
Next is a dungeon map and dungeon room generator from donjon, one of the most recommended tools around. Kassoon has a random dungeon generator where you can tinker with areas such as the Dungeon Start, doors, contents, random hazards and random traps
Onto Traps which every dungeon needs. Donjon has a trap generators which gives 10 traps each time with filters for level and danger. OMGM has a trap generator with details of trigger, save DC, how to spot the trap or the trigger
Another generator from 5nddnd will tell you if a door is locked or trapped.
For dungeon encounters Kobold Fight Club has an option for selecting "Dungeon" as the environment as well as several other encounter filters.
Treasure and Items
Redkat's Treasure Generator has more detail on the items and art and includes a variety of mundane items. Donjon has a treasure generator by CR, and Mithril and Mages has a similar one with the option of more details for gems and art.
For Magic Items, Donjon has a magic item generator with filters by rarity and type.
A variety of weird magic items can be found, from potions of gelatinous transformation to the prismatic blade.
For individuals then take a look at the individual monster tables of Lady Tiefling for Giants, Hags and everything else D&D
And last is a generator for drawing cards from a deck of many things...
D&D Tool Recommendations
I'll keep this guide updated so please suggest D&D generators in the comments or over at the rpg_generators subreddit