Top 20 NuGet ReST Packages

.NET Standard 2.0 version of ServiceStack
Twilio REST API helper library
ServiceStack is a simple and fast alternative to WCF, MVC and Web API in one cohesive framework for all your services and web apps that's intuitive and Easy to use! To get started see: https://servicestack.net/getting-started
A fluent, portable, testable HTTP client library.
TweetMoaSharp is a fast, clean wrapper around the Twitter API. Based on the original TweetSharp.
Lightweight and implementation-free interfaces for DTO's, providers and adapters.
A .NET SDK to make voice calls & send SMS using Plivo and to generate Plivo XML
The DeveloperForce.Force NuGet provides a .NET library for interacting with Salesforce Lightning REST APIs.
This is the core support library for HL7's FHIR standard (http://hl7.org/fhir). It contains the core functionality to working with RESTful FHIR servers: POCO classes for FHIR, parsing/serialization of FHIR data and a FhirClient for easy access to FHIR servers.
Lightweight and implementation-free interfaces for DTO's, providers and adapters.
The DocuSign NuGet Package makes integrating DocuSign into your apps and websites a super fast and painless process.The library is open sourced on GitHub, look for the docusign-csharp-client repository. Join the eSign revolution!
Provides a set of services to be discovered by Swagger (http://swagger.io). Swagger is a specification and complete framework implementation for describing, producing, consuming, and visualizing RESTful web services.
Tweetinvi is an intuitive .NET C# library to access the Twitter REST API. It is a .NET Core library that can be used for development on Windows, Windows RT, Windows Phone, Xamarin Android and Xamarin iOS. Tweetinvi is also compatible with Windows 10 Universal Apps.
Simple.OData.Client is a multiplatform OData client library supporting .NET 4.x, .NET Standard, .NET Core, iOS and Android. The adapter provides a great alternative to WCF Data Services client. It does not require generation of context or entity classes and fits RESTful nature of OData services. ...
Chilkat .NET Class Library (64-bit) for SSH/SFTP, FTP, POP3, SMTP, IMAP, SSL/TLS, Zip, REST, OAuth2, HTTP, RSA, XML DSig, Encryption, Compression, XML, Socket, XMP, HTML to XML, JSON, JWT, OAuth1, conversion, PKCS12/PFX, Java Keystore, ASN.1, PEM, ECC, Async, ...
A library extensions to simplify HTTP usage.
The C++ REST SDK is a Microsoft project for cloud-based client-server communication in native code using a modern asynchronous C++ API design. This project aims to help C++ developers connect to and interact with services.
Implements v2.0 of the Open API Specification (https://www.openapis.org). Open API is a specification and complete framework implementation for describing, producing, consuming, and visualizing RESTful web services.
Simple functionality for Dapplo.HttpExtensions
An OAuth extension for Dapplo.HttpExtensions