- UMLet
| Ripped from website | UMLet is a free, open-source UML tool with a simple user interface: draw UML diagrams fast, build sequence and activity diagrams from plain text, 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.
- Jupyter
Jupyter is a very complex open-source software.
Jupyter Notebook is a tool by Jupyter for creating complex journals capable of inline programming, and much more.