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C# offers much more out of the box in my experience, in Java you'll need frameworks like Spring (Boot) to add functionality that's included in the .NET SDK (asp.net core) and you'll have first party frameworks like Entity Framework Core as an ORM. That said (as others already said) the third party OSS scene isn't strong in .NET land
For instance, recently Chaochao opened a PR for the Windows Community Toolkit to open source the whole custom animation helpers he developed for the Store, which are used to implement the morphing animations you see when scrolling in a product page. You can see a GIF and the whole code here and in the linked PR.