@Gayathri Both cawemo and modeler can be used for modelling BPMN model. In addition to that cawemo has the features like Collaborative model design:
- Share projects with all stakeholders
- Add comments and discuss process diagrams
- Achieve alignment between Business and IT
You can read more https://blog.camunda.com/post/2019/11/cawemo-release-integrations-visual-comparison/