Is there any AI app that is free?

Excuse me, I was wondering if you could possibly enlighten me on a matter. I've been on the lookout for an AI app that doesn't cost a dime. Do you happen to know of any such applications that offer advanced AI capabilities without requiring a monetary investment? I understand that many AI tools are subscription-based or come with a hefty price tag, but I'm hoping to find one that's available at no cost. Could you perhaps point me in the right direction?