Beginner confused about Ollama vs LM Studio vs llama.cpp vs vLLM vs Unsloth — can someone explain?

Hey everyone!

I’m a beginner getting into local LLMs, and so far I’m familiar with Ollama. I’ve used it to download and run models locally, but I’m starting to see a lot of other tools being mentioned, and honestly I’m a bit confused about what each one actually does.

I keep coming across:

Ollama

LM Studio

llama.cpp

vLLM

Unsloth

From what I understand, some of these might overlap while others serve completely different purposes, but I’m not clear on which tool is meant for what.

I’m especially interested in understanding the big picture, rather than just which one is "better."

If someone could explain these in simple terms, maybe with an example workflow showing how they fit together, I’d really appreciate it!

Thanks in advance! 🙏