The solution is BidNobble !

Features

• Allows you to track auctions with prioritised update recording to the time left.
• Snipe tool allows you to schedule your bid to be placed seconds before the auction ends, avoiding driving the price high early in the auction’s life.
• Clock on main window synchronized to eBay time.
• Secure login to eBay via SSL.
• Supported sites: eBay.de, eBay.com, eBay.com.au, eBay.com.cn, eBay.co.uk, eBay.fr, ebay.at, ebay.be, ebay.ch, ebay.es, ebay.it, ebay.nl (more coming soon).
• Sorting of auctions.
• Multiple users support.
• Works on any Java enabled platform (e.g. Windows, Mac, Unix, Linux, BSD, etc…).
• It’s easy to use
• It’s free of charge.

Requirements

• Java Runtime Environment (JRE) 1.4 or newer. Download JRE 1.5 here.
• eBay account.

Discover BidNobble

Under Ubuntu, after downloading it, launch it with :

java -jar bidnobble.jar