WAPI
Get the Addon
WAPI or the World API is built into Atavism and there is no need to update this.
World Manager (WAPI) is a generic world and environment command and control system for Unity that enables environmental assets to play nicely together.
It does this by providing a simple but powerful interface that allows you to control the components that render your environment a generic and coordinated way.
Download the Addon
You can see the latest version of this at the Github repository or download it from the Atavism APanel.