very old PC you need to resurrect with reasonably modern system architecture, try this. The development of SkyOS has sadly been halted, but it's still worth looking at as an example of an OS ...

A complete software engineering project that follows all the formal steps starting from scope fixation, diagrams (ERD, BPMN, Class Diagram, Sequence Diagram and State Diagram) followed by ...

and allocations during specification and design phases of system engineering. SysML uses some UML 2.0 diagrams as is, extends some other UML 2.0 diagrams, and introduces new diagrams to achieve its ...

Workflow/State Machine Engine written in modern C++. Offers a comprehensive DSL (Domain Specific Language) for UML state machines. Comes with a runtime to run, trace and visualize your state machines.