Steam is a place where I have spent a sizable amount of money over the years. At one point I got curious how much that would have been in total, how and where I exactly I spent it, and what other statistics I'd be able to glean from the Steam website.
So I decided to write myself a little tool capable of scanning all that data and generating reports about it. It is capable of scanning the Steam store purchase history, the license activation history, the Community Market transaction history, as well as the trading and gifting histories. It then filters them by calendar year, generates fancy tables and does some minor data aggregation. I file away the yearly PDF just in case I ever want to feel guilty about my spending habits.