Rhino Accounting is free double-entry accounting app in the same style as QuickBooks. Once it's installed you can track income against expenditure, create invoices (which can then be seamlessly e-mailed), and even create paychecks. Rhino isn't for the newbie accountant, lacking setup wizards or even help files, but anybody with a knowledge of existing accounting packages or practices will find the interface intuitive.

Integration with Google Apps comes in the form of importing contacts, although at present you must create entries for companies manually, and only companies can be invoiced. However, each company you deal with need only be added once.

Despite Rhino being free, support is also free of charge and by all accounts of high quality.

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A successful business is one that shares intelligence among its employees, and that can take the form of useful Websites. You can share interesting links among your Google Apps users via the Appogee Bookmarks app. This adds a panel to your iGoogle home page or e-mail inbox that lists URLs. More can be added by any user. Anybody within your domain who also has the Bookmarks app installed can then view the bookmarks.