Lucidchart is the intelligent diagramming application that brings teams together to make better decisions and build the future. Lucidchart is a visual workspace that combines diagramming, data visualization, and collaboration to accelerate understanding and drive innovation. 

https://youtu.be/tETvx7-SdAM

Advantages

• Free version available.
• Inexpensive and cost-effective.
• Easy to learn.

Disadvantages

• No desktop app.

Manual? Please follow this link.