Who Did This? (2017)
Love this. Etymonline is one of my favorite websites, and often my first-choice dictionary (even though its word corpus is smaller than other dictionaries), because IME understanding the roots and origins of a word help me remember and use it better. It's the one dictionary I enjoy looking up.Just in case someone hasn't seen it before... ;-)  
If you're an etymonline fan, I would venture that you might find interesting "You’re probably using the wrong dictionary" by James Somers: http://jsomers.net/blog/dictionary