As of my last knowledge update in October 2021, there are several AI tools and platforms that offer free versions or tiers, but "unrestricted" access can vary widely depending on the platform's policies, terms of service, and ethical guidelines. Here are some options that might be relevant:
1. **GPT-3 Playground**: OpenAI provides limited access to its GPT-3 model through the OpenAI Playground, though usage is generally capped and subject to


