Top 20 NuGet collections Packages

J2N is a library that helps bridge the gap between .NET and Java. It provides components to assist with porting Java code to .NET, such as collections, adapters, and extensions. It contains some features from Java that also make it generally useful in any .NET application.
Simple cross-platform memory mapping for .NET/Mono.
Various classes related to collections. This package was built from the source code at https://github.com/RockLib/RockLib.Collections/tree/5b05c60267ac26098e5038df30b48bd91e0f1e79
A set of useful libraries for many kinds of .NET developers, starting with Loyc.Essentials, a library that "fills in the gaps" in the core of the .NET Base Class Library. LoycCore is especially focused on collections: classes, interfaces, adapters, and extension methods. Plus, Loyc.Syntax.dll parses...
Ecng.Collections
Loyc.Collections is a library of sophisticated data structures that implement standard .NET collection interfaces. It includes ALists, VLists, hash tree types (Set<T>, MSet<T>, Map<K,V> and MMap<K,V>), and min/max heaps.
Objects pooling, buffers pooling, traffic-free collections (PoolingList, PoolingDictionary, PoolingQueue, PoolingStack), non-allocating LINQ
The System.Collections namespace in the .NET Framework provides a number of collection types that are extremely useful for manipulating data in memory. However, some specialized implementations of ISet are not available. Iesi.Collections 4.0 for .Net 4.0 contains the LinkedHashSet (preserves inserti...
Backported read-only collection interfaces
Provides an F#-style API for parallel operations on sequences that are part in .NET 4.0 as System.Linq.ParallelEnumerable class. The API is akin to F# operations on sequences.
The package is a part of the Saritasa Tools project. Saritasa.Tools.Common contains various utilities and extensions for DateTime conversion, strings manipulation, validation utils (Guard), parse with default, flow (memoize, retry), collection processing (chunk select), atomic (CAS, swap), strings h...
Extensions for ordered testing with Xunit. Full support for ordering at all levels - test collections, test classes and test cases. Support for AssemblyFixture including IMessageSink injection and IAsyncLifetime. Supports .NET Core 1.x, .NET Core 2.x. and .NET 4.5.2+
This has lots of common standard libraries like MVVM Helpers, New Collection Classes, Extensions, Exceptions, and cross platform converters.
A library of interfaces, extension methods, and small bits of functionality that are useful in almost any software project, according to the theme "things that should be built into the .NET framework, but aren’t". At least half of Loyc.Essentials is devoted to collections: collection interf...
CB.System is a collection of common classes to solve frequently occurring problems.
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...
Sammlung (/'zamlʊŋ/) is german for collection and is pronounced some-loong. This package contains a library for C# containing a plethora of collection types which are not provided by the .NET standard libraries.
A collection of useful data and execution extensions for Bridge.NET
The C5 Generic Collection Library for C# and CLI is a comprehensive collection library supporting lists, sets, bags, dictionaries, priority queues, (FIFO) queues, and (LIFO) stacks. C5 runs on everything supporting .NET Standard 2.0: .NET Core 2.0+, .NET 4.6.1+, Mono, Xamarin, Universal Windows Plat...
Traffic-free collections (PoolingList, PoolingDictionary, PoolingQueue, PoolingStack), non-allocating LINQ