This is great fun. I have downloaded and installed the software for the M4 project – this sort of research is intriguing. And the cost is zero, unless this is a Trojan, in which case my innate trustfulness has received yet another blow.
Update March 3: Had to shut this down – not because it isn’t well behaved (it is), but because the processor load generates heat, which starts the fan in my home workstation, which is irritating in a home office environment. I will install it on a PC I have in my work office, though – that machine has a fan going all the time anyway.