yEd is a user-friendly software to create various types of diagrams on your computers.
Dia Diagram Editor helps you create various kind of diagrams on major desktop platforms.
Want to create flow charts but need an easy to use tool? Wireflow is here to help you out with your flow chart needs.
Diagramo is a free online flowchart software.
Create flowcharts, wireframing, and diagrams online for free and store them locally on a cloud server.