Diagramly: Very similar to Microsoft Visio, used for drawing flowcharts, tree diagrams, or other types of charts.

Diagramly is very similar to Microsoft Visio and is used to create flowcharts, tree diagrams, or other types of charts. It's free, very easy to use, and quite convenient. You only need a web browser to use it anytime and anywhere, without installation or registration. Diagramly allows you to quickly create various professional flowchart illustrations.

The interface of Diagramly is very similar to Microsoft Visio, so you will find it very familiar. You just need to drag and drop shapes, text, and icons onto the grid and connect them with arrows to create a flowchart.