https://openrouter.ai/models?q=:free
For interested in getting some hands-on experience with large language models openrouter has many models available in their free tier.
These aren't chatbots, they are the LLM "engines of thought" that you can use for anything, like openclaw. :-)
You just have to create an account and have instant access to these models, subject to congestion and your comfort level with the cloud provider your requests are routed to.
I noticed this today when I was checking if they had the new nemotron 3 Super 120B A12B model available (they do) and that it was free (it is)
Another great way to get started with AI agents and openclaw.