Gazooka 

Common functionality for .Net applications - generic repository interface, helper methods for working with attributes, built-in types, etc.

System.UriTemplate for .Net Standard

Common unit testing functionality for .Net applications - test generic repository.

Common unit testing functionality for ASP.Net MVC applications - test role store, test user store, test data helpers, better assertions, fluent assertions for controllers, view results and other MVC items.

Common functionality for ASP.Net MVC applications - configuration, generic controller, generic repository, generic version history controller, access denied attribute, account management.

Common functionality for working with NuGet.

Common display templates for ASP.Net MVC applications -- Nullable<DateTime>.

Common editor templates for ASP.Net MVC applications -- Nullable<DateTime>.

Common web-related functionality, including REST and JSON clients to simplify interacting with services.

Functionality for working with Sandcastle Help File Builder.

Functionality for working with Visual Studio.

Common functionality for working with XML.

Common functionality for EF Core applications, primarily having an audit trail in a context.

Version history controller and views for displaying the version history in an MVC application.