Is there a free chatbot?

Hello there, I'm curious about chatbots and their availability. I've heard that they can be quite useful for various purposes, including customer service and automation. So, I'm wondering, is there a free chatbot available that I can use for my own needs? Perhaps one that's easy to set up and customize, without breaking the bank? I'd appreciate any insights or recommendations you might have on this topic. Thank you in advance for your help!