How can I use it with a Ollama model? I mean I needs to run it with a model runing on my pc

Support for ollama models is forthcoming. You can track this issue for when it lands: https://github.com/julep-ai/open-responses/issues/2

hey what are the supported tools? Can I use custom tools in this one?

If you mean function calling, then yes. Also, web_search works out of the box using Brave Search API as a provider. We have planned support for File Search and calling REST APIs.