Loyc.Interfaces (nuget): A library of interfaces, enums, and delegates that are useful in a broad range of software projects, according to the theme "things that should be built into the .NET framework, but aren’t".          Also contains a small number of essential structs and classes, most notably Symbol, UString, Maybe<T>, and Localize. These are types that the interfaces refer to, or that the concrete types themselves depend on.
Keywords: Loyc|Core|Interfaces|Collections