A modern file system for .NET (it's frustrating, annoying and embarrassing that Microsoft never fixed this stuff). Supports advanced NTFS features: long paths, hidden volumes, hardlinks, transactions, alternate data streams, etc.
The .NET Portability Analyzer is a tool that provides you with a detailed report (example report) on how portable your code is across .NET platforms by analyzing assemblies. The Portability Analyzer is offered as a Visual Studio Extension and as a console app.
Squirrel is a set of tools and a library for managing the install and update of Windows Desktop applications.
Under the covers it uses NuGet packages, and deploys apps silently to the user's LocalAppData folder, so it doesn't require UAC, but does put the app in a vulnerable location.