Which image editor can be used within Drupal for creating flowcharts? I am looking for an image editor within Drupal. Particularly, I need something that will help me create flowcharts and save them directly. 

The idea is to avoid using an offline image editor, to make the site more user-friendly.

Any pointers?
Try Image Editor module 


  integrates several popular online image editing services into Drupal:


There are integrations with quite a few popular online image editing services.