Top 20 NuGet slack Packages

Send messages to slack channels via Incoming WebHook Intergrations.
Connect to Slack using an incoming webhook url
Slack OAuth provider for OWIN to use with ASP.NET 4.5
Simple SlackClient to post a message to a channel
Simple Slack client that does not require use of WebHooks
A self-hosted slack bot for responding to outgoing webhooks.
A simple C# Slack Web API client library.
C# wrapper around the Slack API using Reactive Extensions. Taut is not created by, affiliated with, or supported by Slack Technologies, Inc.
Synchronous C#.NET Slack WebAPI library, designed to be as simple as possible to use.
An ASP.NET Core authentication provider for Slack slash command and interactive component tokens.
Rest Library for various providers
A fast and easy to use framework for building Slack bots with .NET.
An appender for log4net loggin library to post logging events to Slack.
Verbose logging extension for Serilog.Sinks.Slack.Core
Slack BlockKit blocks, elements and compositions.
Slack Client for posting messages to channels using webhooks.
I developed a logger package for Nuget. SlackLog is using Slack for logging.
A set of utilities to work with Slack
Class library containing models for Slack APIs.