JetUML

What JetUML is

JetUML is a free desktop UML editor for sketching software design ideas. It supports class, sequence, state, object, and use case diagrams, with a focus on a minimalist set of core diagramming tools. Association edges are laid out automatically, and moving nodes changes their paths. The editor checks diagrams for validity and reports problems through temporary notifications. Diagrams can be exported as SVG, PNG, or JPEG images, or copied to the system clipboard for use elsewhere. Files are stored in JSON using a documented open format, with a schema for each diagram type. JetUML is available for Windows, macOS, and Linux as Java archives; the operating-system-independent archive requires Java and JavaFX. A community Nix package is available for macOS and Linux. The software is distributed under the GNU General Public License version 3 or later. JetUML says it collects no information and accesses the network only to open web pages through Help commands. Its user guide notes that larger diagrams reduce application performance.