Which is the best system to design a workflow and to help users execute that worfklow?

3 of the most well-known are Bizagi, Pega (Pegasystems) and OpenText AppWorks.

Thanks for the info Gerhard

I would vote for Camunda. Opensource, good community. The founder is a developer and still active in developing the product as well as business development - good mix I would say. With regards to “execution” their focus is on implementation through code instead of clicking through endless options and overloaded menus.