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> are all open models still just derivatives of llama?

No there are several others but by far the best alongside llama are Mistral’s mistral and mixtral models. Those are called the foundation models which everyone else builds on top of

Definitely not. Here's 300+ LLMs without derivatives:

https://lifearchitect.ai/models-table/

No, but there's a reason so many adjacent libraries and software packages name themselves after Llama (Ollama, llama.cpp, etc)