Mozilla llamafile uses it. Bundles model weights and an executable into a single file, that can be run from any cosmo/ape platform, and spawns a redbean http server for you to interact with the LLM. Can also run it without the integrated weights, and read weights from the filesystem. It's the easiest "get up and go" for local LLMs you could possibly create.
Yes I should have mentioned that, even when I originally interpreted the OP to be asking about other projects using it, not necessarily other people. But they almost certainly meant other people not other projects, so my point is kind of void.
Although in fairness, the Mozilla org choosing Justine/cosmo is basically the kind of sign-off from a 3rd party that OP was looking for.
