I can't put up the demo for public yet, but I give access happily to anybody who wants to look into it and promise me to give some feedback (it would be good to hear somebody else's opinion).

Please send an email to tester.sc at purplehead.uk and let me know what sort of computer you have. I can offer tested versions for Windows and Mac, and I have an untested Linux version. I also can invite you for a closed testing on iPad (through TestFlight).