Just posting updated links for some of the things listed in this thread, since most things have changed locations in the last 6 years.
--- Neverwinter Vault --- https://neverwintervault.org: This community-created and maintained site is the central repository for new and old custom content. Adventure modules, new art assets, graphical overrides, you name it.
The IGN NWVault was shut down, but before that happened the vast majority of the content was rescued and can now be found at this new Vault. If you are looking for something that was on the old Vault, you can search for the title or ID number of that content on the new Vault.
The Neverwinter Vault is also home to the NWN and NWN2 community forums, where most people moved when EA/BioWare shut down their 2nd set of NWN forums.
--- Neverwinter Nights Community Site --- https://www.neverwinternights.info: This site contains and links to a wealth of knowledge collected by the community since the game was released in 2002. If you are new to the game, or returning, this is a central place to start for players, DMs, module builders, and custom content makers.
--- Community Expansion Pack (CEP) --- http://neverwintervault.org/cep: The CEP is a massive collection of community-made content that builders can use to make modules and that players use to enjoy countless single-player and multi-player modules/servers.
I have been working on fixes and updates to the CEP since 2014, with the new versions remaining backward compatible (players with the newest version can play modules/servers made with previous versions back to CEP 2.1).
--- Project Q --- http://neverwintervault.org/project/nwn1/hakpak/combined/project-q: Project Q is another collection of community-made content that builders can use to make modules and that players use to enjoy more modules/servers. Some of the newer content in this package can be used to update modules that use default NWN art assets.
--- Hall of Fame Modules --- https://neverwintervault.org/article/reference/neverwinter-nights-hall-fame: The community has created countless adventures, many vastly outshining the Original Campaign. This list links to some of the best produced over the years.
--- NWN Patches --- https://neverwintervault.org/patches: Some people are still having glitches with NWN Diamond downloaded from gog.com. If you are, be sure to go to this site to get and run the English 1.69 Critical Rebuild (NWN + SoU + HotU).
--- Beamdog NWN:EE Forums --- https://forums.beamdog.com/categories/neverwinter-nights: Beamdog has been working on updating NWN (working with several community members) and they recently set up forums for broader community input and beta testing.
Well, I think this pretty much covers the biggest links for now. Enjoy.
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The Amethyst Dragon