Step 1: Understand the task
The task is to find a free AI voice generator.

Step 2: Research available options
There are several online tools and websites that offer free AI voice generation services、Some popular options include online texttospeech (TTS) platforms.

Step 3: List potential free AI voice generators
Some potential free AI voice generators include:
Google TexttoSpeech
Amazon Polly (offers a free tier)
Microsoft Azure Cognitive Services Speech Services (offers a free tier)
TTSMP3
NaturalReader
Balabolka
Voice Dream Reader

Step 4: Evaluate the options for free usage
Google TexttoSpeech: Offers a free tier with limitations.
Amazon Polly: Offers a free tier with 12 months of free usage for certain services.
Microsoft Azure Cognitive Services Speech Services: Offers a free tier with limited usage.
TTSMP3: A simple online TTS service that is free.
NaturalReader: Offers a free version with limitations.
Balabolka: A free TTS software for personal use.
Voice Dream Reader: A mobile app with TTS capabilities, offers a free version.

Step 5: Identify the most suitable free AI voice generator
For a straightforward and free AI voice generation, options like TTSMP3 or Balabolka are readily available and do not require extensive setup or subscription.

The final answer is: TTSMP3.