Feel free to link relevant communities here! When I think they're relevant enough I'll add them to this opening post.

Alternative game development communities:

• Game Development at !gamedev@lemmy.ml
• gamedev at !gamedev@lemmy.pineapplemachine.com
• Game Development at !gamedev@pawb.social
• Game Design at !gamedesign@lemmy.ml
• Voxel Game Development at !voxelgamedev@lemmy.world
• Furry Gamedev at !furry_gamedev@lemmy.ml

Engines/frameworks:

• Godot at !godot@programming.dev
• Godot at !godot@lemmy.ml
• Godot at !godot@foros.fediverso.gal
• UnrealEngine at !unrealengine@sh.itjust.works
• Smolpxl games at !smolpxl@lemmy.ml
• Amethyst game engine unoffical Lemmy community at !amethyst@lemmy.ml

Art and story:

• Pixel Art at !pixelart@lemmy.ml
• Worldbuilding at !worldbuilding@lemmy.ml
• CharacterDevelopment - A place for writers to create and grow their characters. at !characterdevelopment@lemmy.ml
• battlemaps at !battlemaps@sh.itjust.works

Game- and industry news:

• Gamingnews at !gamingnews@lemmy.ml
• Game Updates at !gameupdates@lemmy.ml
• GamingLeaksAndRumours at !gamingleaksandrumors@lemmy.ml

Modding, reverse engineering and preservation:

• Game Modding at !modding@suppo.fi
• GamePreservationists at !gamepreservationists@lemmy.ml
• REGames - Reverse Engineered Games at !regames@lemmy.ml
• retrogamers - pre 2010, Flash, emulated games at !retrogamers@lemmy.ml
• Modded Minecraft at !moddedminecraft@sopuli.xyz
• Xbox 360 Hacking and Modding at !360hacks@lemmy.ml

Game development jobs:

• Game developer classifieds! at !game_dev_classifieds@lemmy.ml

Things of note: The 2nd link in the list above is a relative link; as long as you're on a Lemmy-instance, it should link to the right community relative from your instance. If you get an error saying '404: couldnt_find_community', you will have to search for the community first. For example: [/search/q/!gamedev@lemmy.ml/type/Communities/sort/TopAll/listing_type/All/community_id/0/creator_id/0/page/1](/search/q/!gamedev@lemmy.ml/type/Communities/sort/TopAll/listing_type/All/community_id/0/creator_id/0/page/1). You will get no results, but visiting the linked community should now work. It can take a little bit of time, and posts might not instantly show up. If it still doesn't work, the linked instance might be blocked on your current Lemmy instance. I'd recommend asking your admins for support at that point.