I've been using Gixen for a while. It's the best auction sniper out there - highly reliable, snipe multiple items, create bid groups and much more. Best of all, it's free! None of the paid-for snipers I've tried are anywhere near as good.
@PalToe100 I have used PowerSnipe and it has worked many times but not lately. I don't mind paying although this service is not c h e a p. Still a free service worries me. As does a download system. Funny not much commented on this in about a decade I can find on the internet. I wonder why.