The last full release is X11R7.7 from... 2012
If it's a tractor, it's quite an old one. Give me that new tricyle instead: https://www.youtube.com/watch?v=wy8MZuAwNZc
If it's a tractor, it's quite an old one. Give me that new tricyle instead: https://www.youtube.com/watch?v=wy8MZuAwNZc
After X11R7.7 the Xorg project changed its release model so that instead of making a single release that contained everything, it was split into separate packages each one having its own releases, versioning, etc and being independent from each other.
So depending on what you are looking for you'll get different results for the latest dates, though pretty much all of them would be more recent than 2012. For example when people mention "Xorg" they usually mean the standalone X server xorg-xserver. This had several releases this year with the last being xorg-server 21.1.8 released in March.