It was discussed several times on the forum, but I want to write more privacy friendly alternatives in one post. Keep in mind that chatgpt mostly requires a phone number, especially when you register with vpn.
GPT4ALL : This app helps you run AI models locally even without an internet connection.
Freechat: This is an macOS only and simplistic alternative app to Gpt4All.
LM Studio: This is a very user friendly app with a better UI than others above, but not open source. Still models are open source and run locally.
Perplexity.ai and perplexity labs: Perplexity lets you use their platform even WITHOUT an account. (Still can collect data) It also generates answers including citations to the original source.
They also have a labs page, which offers advanced models for testing such as Llama 70b or perplexity’s own 70b model, which I found very successful.
(some models are experimental)
Leo: Leo is a built-in feature in Brave browser, powered by Llama. The free version can be used without an account.
Hugging Chat: Huggingface offers various models in its page without AN account. (Still can collect data) However, they have recently brought limits and may require an account after some use.
(some models are experimental)
Poe: If you want to test different modes in one platform, you can use Quora’s Poe by registering only with an email. (Still better than using chatgpt directly since it does not require phone number)
Edit: missing links added.