A number of helpful collections, such as a DropOffStack, a PriorityQueue, some binary-search
types that allow chop-searching on virtual collections (not just on an array), and a grab-bag of additional types such as: A ConcurrentTasksRunner, a GuidTimeStamp, a Colour type, and so forth.
Install-Package DotNetXtensions.Common -Version 3.0.1
dotnet add package DotNetXtensions.Common --version 3.0.1
<PackageReference Include="DotNetXtensions.Common" Version="3.0.1" />
paket add DotNetXtensions.Common --version 3.0.1