Any products (with a free tier ) I could use?

What type of app are you looking to make?

Within a week you can use DemoGPT to generate LLM-based applications without any key on GitHub https://github.com/melih-unsal/DemoGPT For now it requires key, you can use with your key today, within a week we will release our new version which supports Llama 2, so no key required anymore.