Myibidder is an Ebay auctions sniping tool available both as web based (free) or standalone Windows application (commercial).
To use the web version you just need to log in in Myibidder site using your Ebay credentials, once entered you have an easy control panel.
Here you can add items by ID or search by title and see actual bid and remaining time, then just set the maximum bid.
Myibidder also provides useful extensons browser extension for Internet Explorer, Mozilla Firefox, Google Chrome and Opera browsers (open Free Stuff tab) and there is also an iOS app available.