Top 20 NuGet hashmap Packages

Classes for converting to and from M42 Collections and .NET built-in collections.
Hashmap binding library for Bridge.NET projects.
Specialized collections with more functionality, features and ease-of-use than the built-in .NET collection classes.
Practical high performance functional programming for C#. Immutable collections, concurrent HashMap, Ref, Union, Lens and Array.
A lightweight JavaScript library that brings proper .NET-like collections and LINQ to JavaScript.
Immutable hash collections