Data is synced from the Chrome Web Store. View the official store page for the most current information.
The extensions allow you to click on a text on a web page to read it aloud using the built-in text-to-speech (TTS) service. You can configure which TTS service to use by clicking on the extension's icon and selecting your favorite voice from the configuration dialog.
It is a Google Hackathon 2012 in Warsaw, Poland, Chrome extension. Each operating system has a text-to-speech service, so consider using them first.
If you need a new feature or spot an issue, you can report it on my GitHub page. I will respond as soon as possible. Remember that it is a side project, and I may have other priorities. But I will try to help as much as I can.