Xero is an emerging leader in online accounting software with offices in the Australia, New Zealand, United States and United Kingdom. Xero is providing business owners with the ability to view their financial position on-line in a way that’s smart, simple and secure. Accountants and bookkeepers can also collaborate via Xero's on-line portal and it also gives them an opportunity to extent their services to streamline their workflow.
Visit the official Xero website for more information. You can also find more information here - Xero on Wikipedia.