NuGet.Resolver by Microsoft

<PackageReference Include="NuGet.Resolver" Version="6.9.1" />

 NuGet.Resolver 6.9.1

NuGet's dependency resolver for packages.config based projects.

<package xmlns="http://schemas.microsoft.com/packaging/2013/05/nuspec.xsd">
  <metadata>
    <id>NuGet.Resolver</id>
    <version>6.9.1</version>
    <authors>Microsoft</authors>
    <requireLicenseAcceptance>true</requireLicenseAcceptance>
    <license type="expression">Apache-2.0</license>
    <licenseUrl>https://licenses.nuget.org/Apache-2.0</licenseUrl>
    <icon>icon.png</icon>
    <readme>README.md</readme>
    <projectUrl>https://aka.ms/nugetprj</projectUrl>
    <description>NuGet's dependency resolver for packages.config based projects.</description>
    <copyright>© Microsoft Corporation. All rights reserved.</copyright>
    <tags>nuget</tags>
    <serviceable>true</serviceable>
    <repository type="git" url="https://github.com/NuGet/NuGet.Client" commit="623fde83a3cd73cb479ec7fa03866c6116894dbf" />
    <dependencies>
      <group targetFramework=".NETFramework4.7.2">
        <dependency id="NuGet.Protocol" version="6.9.1" exclude="Build,Analyzers" />
      </group>
      <group targetFramework="net5.0">
        <dependency id="NuGet.Protocol" version="6.9.1" exclude="Build,Analyzers" />
      </group>
      <group targetFramework=".NETStandard2.0">
        <dependency id="NuGet.Protocol" version="6.9.1" exclude="Build,Analyzers" />
      </group>
    </dependencies>
  </metadata>
</package>