Ebay Sniper tools give users the edge over those who do not use them. It takes just a fraction of a second to bid on an item using eBay Sniper softwares while it usually takes between 5-10 seconds if you bid on an item manually. These tools are usually configured to make a bid just a second or two before the auction ends making it impossible for manual bidders to place another bid before the auction ends.
Ebay Sniper tools have another use that makes them superior. It is possible to group items and configure the sniper tool the way that it bids to win one (or more) of the items in that group. So, if the price that you want to pay for an item was not enough to win the auction in the first attempt it might succeed by bidding on another item in that group.

The best free eBay Sniper software that I know is called Biet-O-Matic and can be downloaded from Sourceforge. It supports item groups, remote control over email, user accounts, unlimited items, adding items by article number or browsing and support of different languages.
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Biet-O-Zilla may be of interest too. It is a Firefox plugin. http://sourceforge.net/projects/bietozilla
Ehh JB that Biet-O-Zilla works with FF 1.0 and i’m runnin 2.0.0.6? Btw noticed that it’s from February 18, 2005 so that explains it.
@OLIRC: I have it running in FF 2.0.0.6. I can’t remember exactly where I got it from. In the credits for it, it says the website is http://mozware.free.fr/bietozilla/, but that isn’t working.
I think what I did is use Archive.org to grab it. That version works with 2.0.0.*. Biet-O-Zilla v0.8.3. Try this link to the archived site: http://tinyurl.com/39arwt. Sorry bout that.
Nope JB no go which could be that i’m runnin Swedish OS with then Swedish FF? Just get’s me “not a valid installation packet” when i downloaded it because direct install didn’t worked so i’m givin up now.
I have another extension for Firefox to snipe eBay auctions. It’s currently in Sandbox section, but in working condition. I think you have to register on addons.mozilla.org in order to access this section.
Supported for latest Firefox 2.0.0.x:
https://addons.mozilla.org/en-US/firefox/addon/5571
You can see a screenshot first to make sure this is the one you want. I like it myself :)
I just downloaded JoyBidder from Mozilla add-on site. It has similar and more functions as Biet-O-Zilla.
There isn’t much documentation or help, but if you have used Biet-O-Zilla, Auction Sentry or any other sniper software before, you should be okay.
Here is the link.
https://addons.mozilla.org/en-US/firefox/addon/10917
Oh, since it is new and still in experiment status, so Mozilla requires you to login to download the addon.