Global templates

Several proposals to make templates shareable across wiki instances over the years. Here's a list of relevant pages:

Which templates should be global? (discussion, mostly in 2017, with occasional additions later)
Global-Wiki (discussion between 2013 and 2017; closed)
Multilingual Templates and Modules (on mediawiki.org; implemented as a bot, but currently inactive)
Wikitemplates (discussed in 2017, not currently active)
Template repository (on mediawiki.org; proposed in 2008, not currently active)
Abstract Wikipedia, also known as Wikifunctions — a distinct, but somewhat comparable project in active development
Global templates (alternative concept) — a person idea concept of Dušan Kreheľ.