I fail to see why you would need anything more than a generic drawing tool - try OpenOffice!

https://www.openoffice.org/download/

Hi Munzur

As Martin says, OpenOffice, or Libre Office, both of which are free to use, will do what you need. I usually do just that, then take a screenshot of the impage and save it as jpg, png or tif depending on publication requirements. That image will display without issue in any Latex file.

I hope that helps.

Regards

Bob

I don't believe an elaborate open source software is necessary. Good old Microsoft PowerPoint can create a masterful conceptual framework model.