Every NFL play for the past 10 years in CSV format
I'm frankly surprised that this information is allowed to be distributed.  I spent awhile in the financial services industry, and while it was really easy to obtain "public" information like stock quote data, I recall that we weren't allowed to simply scrape data from public sites... we had to pay a license fee to get a feed of the data if we were planning on repackaging & distributing it.It seems to me that the NFL would want to have exclusive rights to distribute this data and charge people a fee for access to it.  Clearly I'm no expert in these legal affairs though.