3 Free and Open-source Uml Apps for macOS (Intel and Apple Silicon)

1- Dia

Design flowcharts, UML diagrams and Databases

Dia is a free open-source program for designing and building technical diagrams. It is fairly easy to use and can be installed on macOS, Windows, and Linux.

Read about Dia 's features, license, platforms, and more.

2- Pencil

An open-source GUI prototyping tool that's available for ALL platforms.

Pencil is built for the purpose of providing a free and open-source GUI prototyping tool that people can easily install and use to create mockups in popular desktop platforms.

Read about Pencil 's features, license, platforms, and more.

3- System Designer

A low-code development platform for creating systems

System Designer is a free open source app that helps you to design systems and system components and generate the right classes for your workflow requirement.

Read about System Designer 's features, license, platforms, and more.