From WikiApiary, tracking Bootstrap and over 3,200 other skins

Name: Bootstrap (ID: 11877) Default skin image
Author(s): No authors provided.
Description: This is a customizable responsive Bootstrap MediaWiki skin. With it, your MediaWiki skin can take advantage of some of the great features from Bootstrap.
Tags: Bootstrap
Related extensions: This skin has no related extensions.
Derived from: This skin is not derived from another skin.
Website count: 200 (1.07%)
Websites using as default 53
Websites skipping it 0
Segments Day: 5 Hour: 21

Bootstrap is default skin on websites:

Bootstrap is an available skin on websites: