Another option is ai|coustics, which converts your voice recordings into studio-quality audio with background noise removal, echo cancellation and distortion filtering. It works with all languages and accents, so it's good for e-learning. The web app is easy to use, with an interface for uploading files and applying processing, and it can handle more than 40 file formats. Batch processing is also an option, so it can be a good way to handle groups of files.
For a full text-to-speech package, PlayHT has a library of more than 600 ultra-realistic AI voices spanning multiple languages and accents. Custom pronunciations, voice inflections and real-time voice cloning are among its features. It's good for e-learning, video voiceovers and other uses, with a variety of pricing tiers and support resources.