Quickstatements is a useful tool that is also being requested by 3rd party Wikibase installations. We should offer a container for it so it can be easily added to a 3rd party setup.
The QuickStatements code is available at https://phabricator.wikimedia.org/source/tool-quickstatements/
As of recently (https://twitter.com/MagnusManske/status/985850832938815488) this includes specific changes by @Lucas_Werkmeister_WMDE which should enable 3rd party uses.
There is also code available at: https://github.com/goekesmi/tool-quickstatements/ Which was written for the enslaved project and seems that it may no longer depend on magnustools.