How do I delete NuGet packages that are not referenced by any project in my solution?

You can use Package Manager Console with command: Uninstall-Package PackageId to remove it, or just delete package folder from 'packages' folder under solution folder. More information about Package Manager Console you can find here: http://docs.nuget.org/docs/reference/package-manager-console-powershell-reference.

An alternative, is install the unused package you want to delete in any project of your solution, after that, uninstall it and Nuget will it remove too.

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