The Vulpes Transitions package is a Promise driven transition system that provides a number of components that can be used as a substitute for common animations such as moving a Transform between two points or fading a CanvasGroup in or out.
As of version 0.9.0-preview.1 of this package, you are now able to install it, along with other Vulpes Software packages via the Unity Package Manager.
In Unity 2019 LTS and Unity 2020 onwards you can install the package through 'Project Settings/Package Manager'. Under 'Scoped Registries' click the little '+' button and input the following into the fields on the right.
Name: Vulpes Software URL: https://registry.npmjs.org Scope(s): com.vulpes
Click 'Apply', now you should be able to access the Vulpes Software registry under the 'My Registries' section in the Package Manager window using the second dropdown in the top left.
To use this library efficiently you should first learn about Promises: