Skin:Chameleon
https://www.mediawiki.org/wiki/Skin:Chameleon
Chameleon is a highly customizable responsive MediaWiki skin that uses Bootstrap 4.
Chameleon logo
It currently provides five different layouts to choose from. Each layout is defined in an XML file and is easily adaptable to your needs.
Mentioned at https://www.mediawiki.org/wiki/Suggestions_for_extensions_to_be_integrated#Chameleon
Chameleon skin is a twitter boostrap based skin that can very easily be configured. Many third-party MW installations use it. Often mobile/desktop versions are not wanted, but a responsive design. Chameleon has a responsive design based on the popular Twitter bootstrap and is actively maintained. --Krabina (talk) 08:41, 14 September 2021 (UTC)
Support It is one of the most popular skins --Jeroen De Dauw (talk) 10:55, 14 September 2021 (UTC)
Support Agree. Would use this. - Lbillett (talk) 13:50, 14 September 2021 (UTC)
Support --[[kgh]] (talk) 20:41, 14 September 2021 (UTC)
Support: The most powerful and flexible skin out there. -- Cavila 18:44, 16 September 2021 (UTC)
Support we use this skin essentially in all our wikis. Emwiemaikel (talk) 14:50, 18 September 2021 (UTC)
Its not written down anywhere I can find, but I'm pretty sure bundled extensions all need to be hosted on gerrit, and this is hosted on github - Oppose Oppose as long as its on github --DannyS712 (talk) 17:16, 19 September 2021 (UTC)
Support If you want your wikis to look like a modern website you have to use Chameleon. --Stefahn (talk) 20:30, 21 October 2021 (UTC)