1. Esterel Synchronous Language, http://www-sop.inria.fr/esterel.org/files/
2. Graphiti, http://graphiti-editor.sf.net
3. LabVIEW, http://www.ni.com/labview/whatis/
4. Mathworks Simulink: Simulation and Model-Based Design, http://www.mathworks.com/products/simulink/
5. Open Data Flow (OpenDF), http://sourceforge.net/projects/opendf