draw.io v30.4.1

draw.io (also known as diagrams.net) is the go-to diagramming tool that costs nothing and stores nothing on their servers. Flowcharts, org charts, UML, ER diagrams, network maps — the shape library is enormous, and the interface is surprisingly polished for a free tool. The desktop app is an Electron wrapper that works offline. You can save to your local drive, Google Drive, OneDrive, or GitHub. For most diagramming needs, it's a complete replacement for Visio and Lucidchart.