Ha! Great question. Meta (Facebook et al) have funded the best one (llama) which was initially licensed pretty restrictively, leaked off the reservation, and then the new one (llama2) is much more permissive. There are others that are potentially useful for minor or specialized things (e.g., vicuna) but nowhere near state of the art. Llama is the only thing that's potentially close.

Lots of high-level statecraft as to why they funded it -- probably hundreds of millions to develop, soup to nuts. Short answer is nobody knows for sure. Longer answer is that it's probably a strategic move to keep OpenAI and a handful of others (e.g., Anthropic) from owning everything. Meta isn't going to own AI, but they don't want any of these others to, either.

That's just my half-assed take, but I'm sure there are much more sophisticated / informed ones. I'd love to hear them if anyone has suggestions.