This is a list of categorized extensions — i.e. extensions that have sub-categorization such as Category:Parser extensions or Category:Calendar extensions. Categories such as the status and author were ignored in this search. This is by far an incomplete list of extensions and categories.
A list of the 15 most downloaded extensions is available at Special:ExtensionDistributor.
The extensions in parser and hook extensions were ignored, so there may be some extensions in these categories that should probably be in other categories.