For those using Business Process Modeling Notation (BPMN) and Unified Modeling Language (UML)?

can you please give an overview of these software? are effective for you?

This is not software. This is a business language or notation. But, there are many software packages available to help you develop appropriate documents. Microsoft Visio is an brilliant tool for making UML documents. It can help the music business processes and help implement better systems. UML includes various types of documents. I recommend you take a trip to a excellent library and cash books of UML and BPMN. A proper document can help you visualize a process or a state where people can discuss the appropriate designs quickly. As a software developer, I use it constantly as a means of communicating designs or document unfilled business processes.