OpenAI’s GPT-3: GPT-3 (Generative Pre-trained Transformer) is a free chat model developed by OpenAI that can generate human-like text based on a given prompt. It has various applications, including chatbots, content creation, and language translation. To use GPT-3, you need to sign up for an API key and follow the instructions on the OpenAI website.

Hugging Face’s Transformer: Transformer is a free chat model developed by Hugging Face that can generate text based on a given prompt. It has various applications, including chatbots, content creation, and language translation. To use Transformer, you need to install the Hugging Face library and follow the instructions on the Hugging Face website.

ChatterBot: ChatterBot is a free chat model developed in Python that can generate text based on a given prompt. It has various applications, including chatbots and customer service bots. To use ChatterBot, you need to install the ChatterBot library and follow the instructions on the ChatterBot website.

DeepPavlov: DeepPavlov is a free chat model developed by the Russian research organization Dialog Research and Production Center. It can generate text based on a given prompt and has various applications, including chatbots, customer service bots, and language translation. To use DeepPavlov, you need to install the DeepPavlov library and follow the instructions on the DeepPavlov website.