There are several free chatbot platforms that you can use to create chatbots similar to Chat-GPT:

OpenAI’s GPT-3: GPT-3 is a language generation model developed by OpenAI. It is capable of generating human-like text and can be used to build chatbots. You can use the GPT-3 API to build chatbots that can engage in conversation with users and respond to their questions and requests.

Botpress: Botpress is an open-source chatbot platform that allows you to build and deploy chatbots on various channels, including Facebook, Slack, and WhatsApp. It offers a drag-and-drop interface for building chatbots, as well as integration with popular chatbot frameworks such as Dialogflow and Rasa.

Chatfuel: Chatfuel is a chatbot builder platform that allows you to create chatbots for Facebook Messenger. It offers a visual interface for building chatbots and comes with pre-built templates and integrations with other tools and platforms.

ManyChat: ManyChat is another chatbot builder platform that allows you to create chatbots for Facebook Messenger. It offers a visual interface for building chatbots and comes with pre-built templates and integrations with other tools and platforms.

Dialogflow: Dialogflow is a chatbot platform developed by Google that allows you to build and deploy chatbots on various channels, including Facebook, Slack, and WhatsApp. It offers a visual interface for building chatbots and integrates with other Google services such as Google Cloud and Google Maps.

Botkit: Botkit is an open-source chatbot framework that allows you to build chatbots for various platforms, including Slack, Microsoft Teams, and Facebook Messenger. It offers a range of tools and libraries for building chatbots and comes with integration with popular chatbot platforms such as Dialogflow and Rasa.