Top 20 NuGet extension Packages

Design and build-time code-gen for records, unions, lenses and immutable With functions
Extensibility library.
Convenience methods for enums.
A testing library for selenate to help with test automation.
Support for Reactive Extensions overloads for various types in the LanguageExt.Core
A library for .NET that integrates the Voice Capture Dmo with LiveSwitch.
Parser combinators library based on Haskell Parsec. This is part of the LanguageExt functional base class library and requires LanguageExt.Core
Provides token replacement for interpolated (templated) strings not known at compile time such as those retrieved from data stores using a variety of token to value mappers.
Helper methods/classes for operating on objects of type IEnumerable.
Screenshots extensions, like screenshot a entiry page. For examples of usage, see the github project page.
Helper library for LanguageExt.Core that facilitates conversion between F# native types like Option, Map, List, etc to .NET and Language Ext types.
A simple library for loading plugins.
A collection of useful extension methods
DotNetCore.Extensions
Forge NHibernate ORM Extensions
String extension methods for performing {named} {{parameterized}} string formatting, written for NetStandard 2.0
Adds some convenient extension methods to strings.
Helper methods for operating on objects of type ICollection.
A library for .NET that integrates YUV image converting and scaling (libyuv) with LiveSwitch.
A library for .NET that integrates XirSys hosted services with LiveSwitch.