Lucidchart

Lucidchart provides an intuitive and collaborative diagramming solution for our community and is integrated with our Google Apps. It has a simple user interface with drag and drop functionality, has real-time collaboration so you can work with others simultaneously. When you're finished you can publish your flowcharts as a PDF, or image and easily include it in a report, presentation or webpage.
Because Lucidchart's free flowchart software is web-based, there's no download or installation required so you can use it from any computer. Find hundreds of shapes to use in your flowcharts or upload your own images by simply dragging them on to the canvas. Lucidchart's active community of users has shared hundreds of flowchart examples in the Community Library. Browse the flowchart examples to spark ideas or use one as a template to get you started.

To access LucidChart click the More > LucidChart link from the bar at the top of your Google page

Below are some of the tutorials you can find on the Lucidchart website