abp

Open-source web application framework for ASP.NET Core! Offers an opinionated architecture to build enterprise software solutions with best practices on top of the.NET. Provides the fundamental infrastructure, cross-cutting-concern implementations, startup templates, application modules, UI themes, tooling and documentation. Maintained by abpframework on GitHub, where it has earned 14,391 stars from the community.

It's actively developed around abp, csharp, aspnetcore, and is a solid reference for anyone building with these tools.