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..
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.
For simple ideas the Dungeon Idea Generator gives a location, creator, purpose and history.
Kassoon has a random dungeon generator where you can tinker with areas such as the Dungeon Start, doors, contents, random hazards and random traps
Dungeons need traps for adventurers to encounter.
DND Speak gives a table with 58 deadly traps and hazards
Filling our dungeons with monsters are 100 Interesting Dungeon Encounters from dndspeak.
Kobold Fight Club has an option for selecting "Dungeon" as the environment as well as several other encounter filters.
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 Dungeon Tool Recommendations
I'll keep this guide updated so please suggest D&D generators in the comments or over at the rpg_generators subreddit