The other day I had to make a quick map of the inside of a building, and rather than forcing my poor drawing skills on the people who needed the map, I decided to look for any free charting applications or sites. I remember trying to do this years ago and I found mostly crap. Luckily time marches on and things improve, and I found draw.io, which did what I needed easily and with no fuss right in the web browser! So thanks, draw.io!