There's some source code in the paper for Emu edit at least. If you look at the supplementary material in the paper, you'll see they spell out the techniques used there too.

I didn't see a repository, but I think in this case, the paper is actually a perfect balance of detail? I think Meta benefits from startups building using their tooling (startups usually buy ads), and so the lack of a full implementation leaves a bit of room for startups to turn the work in to something a bit more production ready.

The cool techniques from the paper are:

Generating a bunch of example images in one go, and using CLiP to score your generated images

And mixing pre-built pipelines and grammars to execute common tasks.

These two ideas alone (with examples) give people in the space plenty to run with.

Great paper!

I don’t think either of these (or the base Emu model) are open source.