draw.io, also known as draw.io Desktop, is a free and open-source diagramming application that allows you to create a wide variety of diagrams, such as flowcharts, network diagrams, UML diagrams, and more.
The source code for draw.io Desktop is available on GitHub under the jgraph organization. You can find the draw.io Desktop GitHub repository here: https://github.com/jgraph/drawio
You can download the latest version of draw.io Desktop from the GitHub releases page: https://github.com/jgraph/drawio/releases
The application is available for Windows, macOS, and Linux. You can download the version that is compatible with your operating system and install it by following the instructions provided in the repository.
It’s important to note that the installation process may vary depending on your operating system and that you may need to have some development tools installed on your computer to build the application from the source code. It’s advisable to check the client’s website for the most up-to-date information and instructions.