Bankr is a personal expense tracking tool I made when I moved out from my parents. By scraping the mobile phone version of my internet bank I made some functions to access the list of transactions on my account. I coupled this by a simple web front-end that allowed me to put each transaction into its own category. The categories were deep, meaning I could have a category called "Living expenses" which would have categories such as "Rent" and "Internet access" within it. That way I can see how much I have for living expenses, but still break it down into more fine grained information.
The initial version used OpenID 2.0 but when that was discontinued by Google I decided to put the site in localhost access only, since it wasn't used by anyone but me anymore.