Parallel execution of keyword driven test framework based tests implemented in c#. NUnit makes it very easy by virtue of its simple and meaningful attributes. Even for making the tests data driven it's very easy and takes very less time. It has integration with speckflow for executing bdd scenarios you just need to plug it by installing the nuget package.

Simple to Use and implement. Easy to setup and straight forward when it comes to testing my .Net Standard Projects

Excellent unit test framework which can easily be used to unit test any code. Integration with CI pipeline using Jenkins makes it easier to execute on every build making sure code quality is not compromised