Business Architecture Standards
||Use modeling and Notations for Business Process Diagram (BPD) defined in Business Process Model and Notation (BPMN) for creating graphical models of business process operations.
Some are free tools listed below
Draw.io (web and desktop) (https://app.diagrams.net/)
||To define enterprise business processes with web services, use XML based language OASIS Web Services Business Process Execution Language (WS-BPEL).
||Use UML which is a tool which helps in visualizing architectural blue prints such as activities, individual components of a system, interaction of entities, user interface etc.UML also can be used for business modeling.