Top 20 NuGet extensibility Packages

Reference assemblies for Visual Studio Project System Extensibility
Visual Studio Project System Extensibility
Build tools used for building extensions to the Visual Studio project system.
Lightning fast MEF engine, supporting System.ComponentModel.Composition and System.Composition.
High-level, composable and testable APIs for working with IDEs.
Extensibility library.
The MEF attributes and runtime classes in the .NET Managed Extensibility Framework (MEF) that are used for imports and exports, and exception types, in a .NET Standard compliant NuGet package form, as found in the System.ComponentModel.Composition namespace.
An implementation of the Tcl scripting language.
Provides the Common Composition bindings for Unity.
An implementation of the Tcl scripting language. This package contains the MSBuild tasks and PowerShell cmdlets that enable integration [with Eagle] as well as the command-line shell [for Eagle].
Provides custom types, helpers and extension methods for Visual Studio extensibility.
An implementation of the Tcl scripting language. This package is built with options that make it more suitable for use with Mono. Features specific to Windows and/or the .NET Framework will be unavailable.
An implementation of the Tcl scripting language.
A simple library for loading plugins.
Adds a VS MEF system with a pre-computed, cached MEF graph.
Static code analyzer to detect common mistakes or potential issues on the C# code that uses Visual Studio Project System APIs.
A NuGet package which can be used to easily create item and project templates for Visual Studio.
Provides useful extension methods for primitive .Net data types.
Common targets to create version-aware Visual Studio extensions easily.
An implementation of the Tcl scripting language.