Once the OGL 1.1 nonsense broke he sat down and spent two weeks rephrasing every section of the 5e SRD so that they were no longer copyrighted to WotC, and released them into the public domain.
That's right, the entirety of the 5th edition rules in a copy/pastable format. Free and remixable,
I am amazed at the sheer amount of work "Grim" Jim was willing to put into this project for a hobby that has not treated him well. Thanks Grim!