For native English speakers 'stalker' means roughly the same thing as 'sexual predator.' I love Tarkovsky too but I suggest you pick a different name unless you are prepared for a lot of negative reaction from non-programmers who think you're making software for rapists or something. Sorry :-/

thanks for feedback. to be honest, I was aware of the connotation, but no better word came to my mind at the time. feel free to suggest a better "brand name", if I will identify with it, I am open rename the project (and mention you in credits :)

I know how it is! Offhand, the best thing I can think of is that Janus, the Roman god that surveyed past and future is also a guardian of doors ;)

thank you for proposal, I was not aware of this interesting deity. But i decided to keep Stalker alive, I believe its name fits better the purpose despite its negative connotation.