3. OpenTTS

• Details: OpenTTS provides open-source implementations of TTS models and voices. You can use their voices under permissive licenses (such as Apache 2.0) for cloning or personal projects.
• How to Use: You can access OpenTTS models and resources on GitHub.

4. VCTK Corpus

• Details: VCTK is a speech dataset containing recordings from multiple speakers. It is free for academic and commercial use with proper attribution. This dataset can be used for voice cloning, but it's important to adhere to their license conditions.
• How to Use: You can download the dataset here.