This wiki hosts a registry of Wikibase instances.
Set up in Antwerp during a workshop on an ecosystem of Wikibase instances federated around Wikidata.
If you have a Wikibase install to add please go ahead.
A blog post documenting the setup of this install using the Wikibase docker images can be found @ https://addshore.com/2018/04/wikibase-of-wikibases/
The workboard for this project can be found on phabricator https://phabricator.wikimedia.org/tag/wikibase-registry/
We are using this registry (which is itself a Wikibase instance) as a test case to document customizations, bug fixes and other steps needed. What we learn on the way will then hopefully (and you can help with that) find its way into documentation and workflows for setting up, configuring and maintaining other Wikibase instances.