Buckets is a Widget alternative plugin for Wordpress. You can use it instead of Widgets or along side them. It allows you to put reusable buckets of content anywhere you like. Even on a per page basis.
It's meant to be an expansion for the ACF and ACF Pro plugins.
Documentation is available on google docs: https://docs.google.com/document/d/1fDhqmtKWTy-0oxTP8GUg7wdhv-VULNoBFkJbLvKNdzo/edit?usp=sharing