The snipe bid is placed by the sniper server, some have a small subscription fee so that there is also a backup server if something goes wrong with the first server - they guarantee your bid will be placed 100% if you subscribe or about 99.5% if you use the free version.
After reading that quote I started to think about what software was out there. We love google, but there's way too much to sift through.
So you you snipers - any recommendations/experiences to share about software you have tried?