I'm working on a simple expense/income tracker that me and my wife can use. Excel sheets/templates and other finance apps are way too complicated, we both agreed that in the end accounting is as simple as taking down notes in a ledger -- why not enter those entries just as easy as tweeting (categorize expense/income in hashtags, etc.)

http://imgur.com/a/fCJJv

It's not as complex or innovative as other accounting systems and projects in here, but it's working out for the both of us and we're using it.