Top 20 NuGet Packages

Olive Framework
F# style discriminated unions for C#, using a custom type OneOf<T0, ... Tn> which holds a single value and has a .Match(...) method on it for exhaustive matching. Simple but powerful.
This package contains the OPC UA reference implementation and is targeting the .NET Standard Library.
An open source code coverage tool (branch and sequence point) for all .NET Frameworks 2 and above (including Silverlight). Also capable of handling 32 and 64 bit processes. Use ReportGenerator for best viewing results (also available via Nuget).
Light, simple and fast convention-based code-first POCO ORM for Sql Server. Support for Creating and Dropping Table Schemas from POCOs, Complex Property types transparently stored in schemaless text blobs in SQLServer.
Adds additional OAuth providers for OWIN to use with ASP.NET
reCAPTCHA for ASP NET Core
PangoSharp is a C# wrapper for the Pango library.
PCRE for PeachPie.
Prism provides an implementation of a collection of design patterns that are helpful in writing well structured and maintainable XAML applications, including MVVM, dependency injection, commanding, event aggregation, and more. Prism's core functionality is a shared code base in a class library that ...
.NET client library for the Prometheus monitoring and alerting system
Provides simple access to fast and efficient "Protocol Buffers" serialization from .NET applications
PubNub is a Massively Scalable Web Push Service for Web and Mobile Games. This is a cloud-based service for broadcasting messages to thousands of web and mobile clients simultaneously
Quartz.NET JSON Serialization Support; Quartz Scheduling Framework for .NET
Rebus is a lean service bus for .NET
Provides an Azure Service Bus transport for Rebus
Provides a service provider-based container adapter for Rebus (i.e. integration with Microsoft.Extensions.DependencyInjection) as well as integration with the generic host
Package Description
Refit HTTP Client Factory Extensions
Rhino3dmIO is a .NET toolkit for reading and writing 3dm files