Thank you for making cantools. I'm using it daily and enjoying how easy and powerful it is.
Two other projects also deserve to be mentioned. The opendbc is attempt to make sense of CAN traffic in different cars, they reverse-engineer messages and provide descriptions to each. It's part of comma.ai open source autonomous driving effort. The other project is CANboat which does similar thing for NMEA2000 protocol used on boats.
The industry so far is very closed and rejects concept of interoperability. It's nice that somebody is taking steps in right direction.