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Firefly UML download for Linux

Free download Firefly UML Linux app to run online in Ubuntu online, Fedora online or Debian online

This is the Linux app named Firefly UML whose latest release can be downloaded as FireflyUMLAlpha.zip. It can be run online in the free hosting provider OnWorks for workstations.

Download and run online this app named Firefly UML with OnWorks for free.

Follow these instructions in order to run this app:

- 1. Downloaded this application in your PC.

- 2. Enter in our file manager https://www.onworks.net/myfiles.php?username=XXXXX with the username that you want.

- 3. Upload this application in such filemanager.

- 4. Start the OnWorks Linux online or Windows online emulator or MACOS online emulator from this website.

- 5. From the OnWorks Linux OS you have just started, goto our file manager https://www.onworks.net/myfiles.php?username=XXXXX with the username that you want.

- 6. Download the application, install it and run it.



Firefly UML


Firefly UML is a 100% pure Java application designed to create and edit UML conform diagrams. With class diagrams, sequence and instance diagrams, Firefly UML provides a solid selection from the vast range of existing UML diagram types.
Firefly UML is really easy to learn as it provides you multiple ways of access to the same function - be it mouse action, hotkey, context menu or toolbar icon. And the best thing is: once you have learned how to handle one type of diagram, you also have learned how to deal with the other diagram types, because they all follow the exactly same user interaction patterns.
Besides being user-friendly, Firefly also offers powerful features which other free editors usually do not. For example, you can import your existing Java project into Firefly and generate nice-looking class diagrams within a matter of minutes. You can also go the other way around and export your model as skeleton Java code.


  • Easy to learn and use
  • Tailor-made for Java developers who want quick diagrams for their code
  • Import existing Java projects and let Firefly do the work for you
  • Create and modify class models from scratch directly within Firefly
  • Export your models into skeleton Java code
  • Supports Class diagrams, Sequence diagrams and instance diagrams
  • Firefly enables you to share the same classes in multiple diagrams in your project - change one, and the others will update automatically
  • Project support enables you to keep your files together and quickly load previous projects
  • Fast and powerful custom rendering engine based on SWING


Science/Research, Education, Developers

User interface

Java Swing

Programming Language



Education, Modelling

This is an application that can also be fetched from https://sourceforge.net/projects/fireflyuml/. It has been hosted in OnWorks in order to be run online in an easiest way from one of our free Operative Systems.