Simple undo/redo service based on the memento pattern. It uses delegates to get and set state. You can use different services to track different parts of the application state. The main advantage of this is that you don't have to store the whole of the application state on every change.
MementoContainer is an alternative approach to the Memento design pattern.
It is a lightweight utility that takes a snapshot of your objects' state so that you can easily rollback to a previous state when recovering from errors.
A collection of very generalised helpers for applications and libraries. The idea is to provide convienience methods and building blocks. All in a cross-platform .NET Standard 2.0 library.