A room doesn´t normally just sit alone in a dungeon or adventure. It was probably built with a purpose, alongside other rooms nearby. It's purpose may have change or been adapted over many years, and physical changes may also have happened.
Also, a room may be a lair, or part of a larger lair belonging to one or more creatures. It may be a meeting place, a store, a shrine or a workshop. These generators will help things along...
1) The 5E Dungeon Master´s Guide
The Fifth Edition Dungeons and Dragons DMG has excellent dungeon generation tables on pages 290-301. We are especially interested in the Chambers size and Exits (pg 291), the chamber purpose tables (292-295), current chamber state (pg 296) and other tables for filling out the contents.
A room in a Mine gives us a Lode where metal ore is mine (now depleted)in a square 40 ft by 40 ft chamber with 4 exits. Currently the room is a pool of water, flooding the original contents and it is partially blocked by a cave-in. Some ashes and a high stool can be found by those investigating the chamber.
Pages 179-181 of the Pathfinder Gamesmastery Guide give excellent tables for entrances, room types, mundane & exotic contents and dungeon dressings.
2) Dungeon Rooms at Abulafia
Abulafia contains a number of generators created by it's users. You'll see a guide on creating generators there at another time.
Here we are interested in the Dungeon Room generator, which creates six rooms each time the page is loaded. Each room has a general description, information about the exits and a brief note on what is inside.
The example came from a selection of two meeting rooms, a mine, gymnasium, tomb and pool.
3) Redkat's Room Descriptions
Dungeon Room Descriptions produces well written and brief descriptions of as many rooms as you want to specify.
Two of mine were
- "You enter an unnerving chamber that is lit by fire from down below. It contains trickling water down one wall. "
- "You enter a stiflingly warm chamber that is dimly lit by eerie glowing orbs. It contains a large, ornately carved wooden chair, as well as a strange glowing cloud. The room is trapped with a ballista rigged to fire at the doorway."
4) TPK Random Dungeon
This elegant dungeon generator takes a number and spits out that many one line descriptions for your rooms.
5) System Agnostic Room at EN World
This dungeon room generator by ENWorld user DM Mike gives a room description and then lists out the contents in a table below.
The contents are split out by lighting, walls, contents, encounters, treasure and exits..
Our description was
"This room is poorly lit by an unseen source. It's a dusty, square room about 40 feet by 40 feet. The stone and mortar walls here surround a cobblestone floor. You see a wall engraving, an elaborate sarcophagus, and a creepy statue."
That´s your five for today and now we have the tools for dungeon name, map, description and rooms...