I feel like it’s really far from being open. Besides the training data not being open, the more popular ones like llama and stable diffusion have these weird source available licenses with anti-competitive clauses, user count limits, or arbitrary morality clauses.

No. It’s got a “source available” license allowing only non-commercial use, and revokes the license for anyone who tries to sue them.

There’s lem.el for Emacs.

There was another one but it doesn’t work anymore. It hasn’t been updated in 3 years.