Content and Editing Extensions
VisualEditor:Provides a WYSIWYG (What You See Is What You Get) editor. Makes it easier for users to edit pages without needing to learn wiki markup.
ParserFunctions:Adds logical functions like #if, #switch, and more to the wikitext. Enhances the flexibility and complexity of wiki templates.
Cite:Facilitates the inclusion of references and footnotes. Essential for creating well-cited articles.
Administrative and Maintenance Extensions
AbuseFilter:Allows administrators to set up automatic filters to detect and prevent vandalism and spam.
CheckUser:Provides tools to check the IP addresses of users, helping in identifying sockpuppets and vandals.
ConfirmEdit:Adds CAPTCHA to various actions to prevent automated spam.