Speak2web’s Universal Voice Search Plugin for WordPress
Voice is the future of the search. Many of your favorite websites and search engines will have extensive support for voice commands in the future. The Universal Voice Search Plugin lets you add such a feature to your website. Once installed, the script adds a microphone symbol to your search bar, allowing your visitors to dictate their query.
The plugin is free on Chrome but can work with other browsers with a license key starting from $10 a month at the time of this writing. Universal Voice Search supports 130 different languages.