• Mod.io

• Nexus Mods

• Game Banana

• ModDB

OS Specific Wikis:

• ProtonDB | Linux game compatibility checker. Fixes are often listed alongside reviews.

• AppleGamingWiki

• PCGamingWiki | Regularly has fixes for when games won't run (especially older titles) and QoL mod recommendations. Fixes that work on Windows typically also work when playing with a compatibility layer such as Proton.

Console Modding:

• VitaDB | PS Vita homebrew and ports

• Emulation Wiki | Has a section for emulators and source ports on consoles and handhelds

• Console Mods | Instructions on modding consoles and things you could do with a modded console

• XLinkKai | Remote LAN play

• Insignia | Xbox Live recreation for the original Xbox

• Hacks.guide | Guides for modding the 3DS, WiiU, Vita, Wii, and Switch

• GameBrew | Homebrew for a large number of video game systems

• Wololo | Console modding news

ROM hacking & Game Specific Mods:

• ROMHacking.net

• Open Source Game Clones | A list of open source engine recreations of games.

• SMW Central | Super Mario 3 ROM hacks

• Metroid Construction | ROM hacks for the Metroid series

• Doom World | Doom WADs

• Unreal Archive | Mods for the Unreal Tournament series

• RimWorld Base | RimWorld mods

Utilies:

• ModOrganizer2 | A Highly regarded mod manager that works with several games

• ROM Patcher JS | Online ROM patcher

• OpenSpy | GameSpy replacement service. See this PCGamingWiki page for game-specific replacements

• Nucleus Co-op | Adds local split screen to a large list of games.

• PartyDeck | A Linux alternative to Nucleus Co-op

• PortMaster | A tool for downloading and installing game ports on Linux handhelds

• Wabbajack | Automated modlist installer

Related Lemmy Communities:

• skyrimmods@lemmy.world | TES Skyrim mods

• oblivionmods@lemmy.world | TES Oblivion mods

• morrowindmods@lemmy.world | TES Morrowind modding

• totkmods@lemmy.world | Tears of the Kingdom mods

• 360hacks@lemmy.ml | Xbox 360 modding

• ps4homebrew@lemmy.ml | PS4 modding

• consolemods@lemmy.sdf.org | Game console modding

• wolf3d@lemmy.world | Source port of Wolfenstein 3D

• nexusmods@lemmy.world | Nexus mods

• falloutmods@lemmy.world | Fallout mods

• halomods@lemmy.world | Halo mods

• sbcgaming@lemmy.ml & sbcgaming@retrolemmy.com | Handheld emulators

Other:

• FMHY's Game Mods, Multiplayer Mods, & Homebrew sections

• Unmoddable | Multiplayer/single player mods

• Multiplayer Mods MEGA-LIST | A Google Docs spreadsheet containing a list of multiplayer mods

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This list is not meant to be all-encompassing. The goal is provide links to other communities within Lemmy, some of the most mainstream resources for modding, and larger compilations of resources. I am unable to keep track of every individual project.

Comment below if you would like anything added or altered.