The best free AI for you will depend on what you are looking to achieve. AI can be used for musical content, video creation, copywriting or digital design. Here's a look at some of the best free AI tools:
Lalal AI
Dall-E 2
Lumen5
Copy.ai
JADBio
Keep in mind that with most AI tools, they will allow you to use a basic version for free. To get full functionality, you may have to upgrade to the paid version.