Clone UOX3's GitHub repository to get the source, or download it from this mirror in zipped form.
NB! Remember to check out the UOX3 Docs, which can be found online or locally in your UOX3's docs folder!
The The JScript Vault is a section of the UOX3 Community Forums dedicated to sharing JS scripts with other UOX3 users. Here you can find many interesting and useful scripts, any of which you can download and use for your own UOX3 shard.
The DFN VaultThe The DFN Vault is a section of the UOX3 Community Forums dedicated to sharing DFN files (blueprints/templates for items/NPCs/other content) with other UOX3 users. Here you can find many interesting and useful DFN files, any of which you can download and use for your own UOX3 shard.
Xuri's WorldBuilder
v0.23 - July 20th, 2008
Xuri's WorldBuilder is a combined GM-Tool and worldbuilding utility for both UOX3 and UOXClassic, with limited functionality for Lonewolf.
SectionSyntaxChecker
Created by Charles Kerr on 7/6/21
A command line tool that can scan section-based files such as DFN and INI files in UOX3, and check for syntax errors such as misplaced/missing brackets and braces. Check included readme.txt for details on available command line parameters and examples.
Freeze
Created by Charles Kerr on 9/22/20
A command line tool that can freeze items (and multis) with TYPE=255 from UOX3's 0.99.x .wsc worldfiles into staidx#/statics#.mul files based on the worldnumber of the items in question. At the same time, it will remove affected items from the wsc files. Updated files are saved with .frozen file extension, and original files are not modified.