GMRoomPack

Quick links: marketplace page | documentation
Platforms: All (pure GML extension + helper tool)
Versions: GMS1, GMS2

Note
If you are using GM2023.11 or newer, some of this extension's features can be replicated with room_get_info() / GMRoomLoader.

What it does:

• Exports room(s) to self-contained JSON format (files or scripts)
  (via a small cross-platform helper program)
• Offers tools for loading exported rooms into other rooms at runtime
  (also inserting at offset, picking what to load, keeping track of loaded things...)
• Allows to make your own tools working with room format
  (it's just JSON, after all)

What it can be used for:

• Procedural generation
  (generate placeholders, then insert a random room from a subset in place of each of them)
• Chunked loading
  (split huge rooms into smaller rooms and load/unload them as the player gets near/away from them)
• Prefabs
  (want to design your menus in separate little rooms instead of code?)
• DLC
  (externally load rooms alongside with images/audio)

Overall, this extension is intended to open many possibilities, and I'm excited to see what everyone can do with it

Have fun!