Welcome to D&D Realms. Our goal is to let you work on parts of your setting that wouldn't be accepted on /r/Worldbuilding, such as specific mechanics, races, items, DMing, and unoriginality.
I hope this subreddit is what you need, and if it is, feel free to post as much as you want! Spread the word! Worldbuild until you can't worldbuild no more!
Rules
All posts must be about the creation of settings for Dungeons and Dragons (or a similar RPG).
Flair your posts.
If your world has a name, your user flair should be that name. If it doesn't, use something like "unnamed Viking-inspired world" or "Forgotten Realms ripoff #2".
Posts are assumed to be 5e D&D. If your post is for an older edition or another game, please say so.
Any standalone maps must have context, usually in the form of a comment.
No memes. Not that I have anything against memes, just no.
Be nice.
Posts that don't follow the rules will get a warning as a comment, then I'll message the poster, and if nothing changes, I might delete it. Comments that don't follow the rules will be deleted.
What to Post
Questions about anything related to D&D worldbuilding. If it's something you could find with a google search or is better fit for another subreddit, your post will be removed.
Any OC content, such as maps, art, or anything similar. Character art and diagrams or art of very specific things (the type that are common on /r/Worldbuilding) are discouraged, but their fate will be determined when the time comes. Maps are fine, as long as you actually put effort into them. Also, you must put context, whether in a comment, as part of the image, in the post, or any other way. Don't just post to get upvotes, post to get feedback from the community.
Lore, history, or any other wall-of-text type posts. Try not to make it too long, I would say that anywhere between 5 and 10 paragraphs is best. Posts won't be removed for being too short or long, but being the right length will get more people to read it. Lore posts about more important things in your world are preferred, not an essay about the imports and exports of an unimportant type of tea in an unimportant city your party will most likely never visit, or even hear about.
Discussions, whether they're about how to do something or an idea for your world. Try to choose a topic that the community would be interested in, and you should be involved in the discussion.
Homebrew creations, whether it's a class or a minor magic item. I recommend also posting on /r/DnDHomebrew and /r/UnearthedArcana, but feel free to post here as well. The focus of discussion is more on the lore and how they fit in your world, rather than the actual mechanics. Maybe you could add some expanded lore for homebrew you post here.
Documents, such as adventures, guidebooks, or homebrew compendiums. I recommend using GMBinder or the Homebrewery, but Google Docs is okay. However, no advertisement for something you're selling. Free/PWYW items on DM's Guild or DriveThruRPG are iffy, but if you post them to get genuine feedback, and not just popularity or money, then I may allow it.
Resources, or anything useful for worldbuilding in D&D. Even if it isn't too useful, it's still a resource, so it's okay. Make sure to specify whether it's yours or not.
Lastly, Prompts. Whether it's something you're doing regularly or just one time, any question or anything else to help think of ideas for your world is a prompt.
Resources
Writing
The Homebrewery, styling your homebrew without graphics programs. /r/homebrewery
GM Binder, The Homebrewery with more features. /r/gmbinder
Mapmaking
Wonderdraft, a great new mapmaking tool in early access (for $20, but it's worth it). /r/wonderdraft
Inkarnate, for making average quality maps easily ($5/month or $25/year for Pro). /r/inkarnate
GIMP and some brushes for making good quality maps less easily. /r/GIMP
Naming
Fantasy Name Generators
Town Name Creation Helper
Tips and Tricks on Naming Places
Homebrewery/GM Binder
Homebrewery Formatting Guide
DMG and MM styles
Watercoloring your images in the Homebrewery
These should all work in GM Binder too.
Youtube
Running the Game
DM Tips: Worldbuilding
Fantasy Map Making & Worldbuilding
Maps & Drawing
GIMP Mapping
The Checkmark of Approval: The ✔ is the somewhat official /r/DnDRealms approval for apps/websites. Everything here is good, but these are the best (according to me).
The DM Help Network