I use the Camuna Modeler (https://github.com/camunda/camunda-modeler https://github.com/camunda/camunda-modeler) for business process models with my sideproject

I use the Camuna Modeler (https://github.com/camunda/camunda-modeler https://github.com/camunda/camunda-modeler) for business process models with my sideproject, that tries to describe a startup adventure as a business process to get the acceptance of the middle management of big corporates. It is quite easy to use, well maintained, and comes with all the required features.