iOS: If you're studying and receive a Centrelink allowance such as Austudy, Express Plus could be useful: it lets you track your payments, lodge details of variations in your other income, and update other information such as your study program or address.
Express Plus works for recipients of Austudy, Abstudy, Youth Allowance, and the Pensioner Education Supplement. To stop anyone else messing with your details, you need to define a four-digit pin specifically for the app. You can perform the same tasks over the phone or online, but if you're an iPhone user, it's a potentially handy tool.
Express Plus is a free download for iOS devices.
Express Plus [iTunes App Store]