Are there any truly free (no hidden costs!) AI tools for generating short-form video scripts and ideas?

I'm a small content creator and the subscription fees for most AI writing assistants are just too high right now. I've tried a few 'free' trials that quickly become useless after a week. I'm really hoping to find something genuinely free and effective for brainstorming video scripts or even generating short ideas. Does anyone know of any hidden gems or open-source projects that are actually practical?