I’m developing a mobile app for budget management and expense tracking called Budgeteer. It allows you to keep track of your total expenses, group them by category, and shows you if you’re getting close to or have already gone over budget.
It will be available for iPhone and Android and I’ll describe each step of development, iteratively from design to UI and API development and testing and release and customer feedback.
Look to read about it on http://blog.budgeteer.info