Looking for long-lost domain crawling software, please help!

[RegFee]

A long time ago I had this program that ran as a process in the background of your computer, somehow collecting domain names from around the web. It saved the domains to a specific text file (very important). I'm pretty sure the program itself was a single .exe file, and I think the folder it saved the domains to was 'WWW[something]' by default.

I've crawled around the web myself trying to find this program again, searching for 'grabber' 'crawler' 'spider' but I keep getting the same few programs.

Thanks,
Jorge