Some of the top real-time applications or sample architecture reference projects across different categories are listed in this article. Open-source projects are great for getting started and serve as a good source for architecture reference. There are several open-source ASP.NET Core projects available in GitHub. These projects will help you learn ASP.NET Core technology in-depth, with different types of architecture and coding patterns.

Project templates with batteries included providing the minimum amount of code required to get you going. Templates for API, GraphQL API, Orleans https://github.com/Dotnet-Boxed/Templates

For building Microservices, you are going to need an API Gateway. Check out this article for more details on how to implement a gateway using Ocelot

Listed below are top 3 open sources, cross-platform ASP.NET Core based e-commerce web applications nopCommerce SimplCommerce grandnode

A series of articles describing a better approach to handle role-based, feature-based, hierarchical based roles and permission handling in an application

A developer toolkit for building SaaS applications http://saaskit.net Blog post on how to use SaaS kit https://benfoster.io/blog/tagged/saaskit