huntersoft ripped it off from Halfdone many many years ago...
That's as maybe but it is virtually abandonware and I doubt if the two products are similar these days. Huntersoft last released a stable version in May 2003 and a beta in June 2007 which has progressed no further.

I think at one point there was even a half baked attempt at a trojan in an early version
Not really a trojan, just a booby trap for people who tried to reverse engineer it

The last two versions (and they do update at least once a year) are clean.