Portable.ConcurrentCollections (nuget): This is a .NET Standard 1.0, Silverlight 5.0 and Windows Phone Silverlight 8.0 & 8.1 backport from System.Collections.Concurrent.ConcurrentDictionary and System.Collections.Concurrent.ConcurrentQueue as defined in .NET Core
Keywords: Dictionary|ConcurrentDictionary|ConcurrentQueue|Collections|System.Collections.Concurrent