• Open Source Sequence Diagram Editor

StarUML is compatible with UML 2.x standard, and supports in total 11 kinds of UML diagrams: class, object, use-case, component, deployment, composite structure, sequence, communication, statechart, activity, and profile diagrams. You can also create Entity-Relationship Diagrams (ERD). ERD is one of the most frequently used diagram for database modeling. Our ERD is based on crow’s-foot notation, which is much easier and readable than Chan’s notation.

UMLet v.11.3 UMLet is an open-source UML tool with a simple user interface: draw UML diagrams fast, export diagrams to eps, pdf, jpg, svg, and clipboard, share diagrams using Eclipse, and create new, custom UML elements. (You also might want to check out. Dia is a very good open source drawing tool, and cpp2dia creates UML diagrams from.h/.cpp files. I use it under Linux, I don't know if it runs in other platforms. There is no GUI for cpp2dia, but its command line usage is very simple. UML Sequence Diagrams display an interaction as a two-dimensional chart. Sequence Diagrams are used to design, document and validate the architecture, interfaces and logic of the system by describing the sequence of actions that need to be performed to complete a task. We support allUML Sequence.

UMLet 10.4 - UMLet is an open-source UML tool with a simple user interface: draw UML diagrams fast, export diagrams to eps, pdf, jpg, svg, and clipboard, share diagrams using Eclipse, and create new, custom UML elements. UMLet runs stand-alone or as Eclipse plug-in on Windows, OS X and Linux. Here are 5 open source diagram software for Windows. With these software, you can make various types of diagrams. You can make Block Diagram, Activity Diagram, Use Case Diagram, Class Diagram, Network Diagram, Flow Chart, UML Diagram and more.

Open Source Sequence Diagram Editor

• Creating elements and connecting them are somewhat tedious tasks. StarUML 2 supports many shorthand styles in Quick Edit to create elements and relationships at once such as sub-classes, supporting interfaces, etc.
• StarUML 2 supports Retina (High-DPI) display. All diagrams, texts and icons are razor sharp. You can also get diagrams as the high-dpi bitmap images (PNG and JPEG).
• You can easily find and install extensions via Extension Manager from the official extension registry or Github repositories. Many extensions are open source and hosted on Github. Fork one and make your own.
• StarUML stores models in a very simple JSON (JavaScript Object Notation) format. It can be used easily--in conjunction with mdgen, a command-line tool for custom-code generation based on EJS (Embedded JavaScript) templates--to generate custom codes using user-defined templates.