Squirrel Deployment, Squirrel Delivery, and Application Release Automation by Snovasys.com. Squirrel: It's like ClickOnce but Works. Squirrel is both a set of tools and a library, to completely manage both installation and updating your Desktop Windows application, written in either C# or any other language (i.e., Squirrel can manage native C++ applications). Squirrel uses NuGet packages to create.