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.

QP/C++ Real-Time Embedded Framework/RTOS based on asynchronous, event-driven Active Objects (Actors) and Hierarchical State Machines

Metamodel, visualization, simulation, and code generation for Hierarchical Finite State Machines (HFSMs) following the UML State Machine spec.

C++ based Hierarchical / Finite State Machine library oriented for embedded and RTOS systems.

A minimalist UML State machine framework for finite state machine and hierarchical state machine in C

hsmcpp library for Arduino IDE. Updated automatically on changes in main repository.

QP real-time embedded frameworks/RTOS for Arduino (AVR and SAM)

UML State Machines for Arduino

yasmine - the C++ UML state machine framework

State machine code generator for C++ and Java.