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MSBuild.SDK.SystemWeb
This MSBuild SDK is designed to allow for the easy creation and use of SDK (shortform) projects targeting ASP.NET 4.x using System.Web.
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Nullable
A source code only package which allows you to use .NET's nullable attributes in older target frameworks like .NET Standard 2.0 or the "old" .NET Framework.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
I have some projects stuck on that, but not a lot. For web stuff, https://github.com/CZEMacLeod/MSBuild.SDK.SystemWeb does most of the heavy lifting, although things like publishing are broken.
https://github.com/manuelroemer/Nullable (backport nullable attributes so you can use things like [NotNullWhen]). Alternatively, https://github.com/tunnelvisionlabs/ReferenceAssemblyAnnotator/ is even niftier, as it gives you .NET 5's annotations as well. So the compiler tells you whether a Dictionary.TryGetValue result is nullable or not based on annotations that didn't exist in .NET Standard 2.0.
https://github.com/manuelroemer/Nullable (backport nullable attributes so you can use things like [NotNullWhen]). Alternatively, https://github.com/tunnelvisionlabs/ReferenceAssemblyAnnotator/ is even niftier, as it gives you .NET 5's annotations as well. So the compiler tells you whether a Dictionary.TryGetValue result is nullable or not based on annotations that didn't exist in .NET Standard 2.0.