Acoust is a professional-grade AI voice generator service with more than 200 voices in 30+ languages. It has controls for tone, pitch and emotions, so you can fine-tune your voiceover to sound more natural and nuanced. The service also can translate voices, add background music, and transcribe speech to text, so it's a good option if you're looking for a one-stop-shop for content creation.
ElevenLabs offers high-quality, realistic voices in 29 languages and more than 120 voices, so it's a good option for audiobook narration. You can create your own voices, clone others and fine-tune the voice output. It also offers a free plan and relatively inexpensive paid options, so it's good for those with modest needs.