Vytronics HMI community preview is now released on Github at https://github.com/vytronics/vytronics.hmi
It is 100% free and you can set up a working demo on using Cloud9 IDE in just minutes. Here is an online demo: http://demo-vytronics.rhcloud.com:8000/
Check the github README.md for instructions: https://github.com/vytronics/vytronics.hmi/blob/master/README.md
If you like what you see and want the project to continue to grow then star the repository. Email me any feedback and/or features you would like to see. The system will run on just about any computer (including Raspberry Pi and Beaglebone of course). I will be adding a driver soon for the GPIO so you can create your own embedded SCADA.