Top 20 NuGet Packages

A simple command line parser for .Net Core
Rugland Console Framework is a collection of classes to enable the fast and consistent development of .NET console applications. Parse command line arguments and write your applications usage.
A Windows command-line utility for Amazon's S3 & EC2 web services that requires no installation, is a single .EXE file with no DLLs, and requires only .NET 2.0 or Mono, so will work on a plain vanilla Windows 2003 installation.
Unofficial package for the SqlPackage command-line utility from Microsoft. Command line SqlPackage.exe to integrate in build. Taken from SQL2017 (v14) installation.
TCLAP
Farkle's command line helper tool. It can list the precompiled grammars of an assembly and create templated text like HTML pages from them. Installing this tool is also required when building a project that uses the precompiler from Visual Studio for Windows, or with the classic "msbuild" command.