There are a number of tools that are useful in fighting cross-wiki vandalism and spam. This page is aimed at listing those tools.

Rights

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Global sysop
A global group with sysop rights on hundreds of small wikis.
Global rollback
The ability to use rollback on all projects allowed by policy.

Special pages

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Special:Globalblock
(stewards) Allows stewards to globally block an IP address.
Special:CentralAuth
(stewards) Allows stewards to lock a unified account, such that a user can no longer login.

User scripts

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xwikirollback.js
Needed for rollback links as used in some tools to work.
hideuser.js
(stewards) Allows for easy local hiding of locked SUL accounts.
removeSpam.js
(anti-spam) Helps removing links from a page.
CVNSimpleOverlay_wiki.js
(cvndatabase) Integrates CVNBot's global database with MediaWiki-pages. Supports global black-, grey- and whitelist. And the global watchlist for page titles.
SBHandler
(anti-spam) A gadget to help dealing with the spam blacklist.
coibot.js
(anti-spam) A gadget to assist in dealing with XWiki reports
blockOptions.js/globalBlockOptions.js
Gives tabs to quickly block using common settings.
massBlock.js/globalMassBlock.js
Quickly block lots of IPs.
Ajax_sysop.js
Speed up lots of administrative tasks.
autoDelete.js
Speed up deletion of vandalism pages.
modRollback.js
Improves workflow of rollback.
User:Mike.lifeguard/remote.js
(anti-spam/countervandalism) Meta-script pulls together many user scripts for use doing work cross-wiki.
StewardScript
(stewards) Improves aspects of the steward interface and workflow.
stewardlinks.js
(stewards) Adds a steward toolbox in the left sidebar with useful information and links.

Toolserver

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Services

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SynchCrosswiki
A service to create userpages on all wikis.