Is there any good 'Speech to Text' application available for Ubuntu?
I have tried to find something in Software Center but I failed.
There is a package called simon that can be installed through the software center.
From the Simon description:
Simon is an open-source speech recognition program and replaces the mouse and keyboard. It is in development for physically disabled people and seniors to give them the possibility to chat, to write e-mails, to surf the internet, to do internet-banking and much more. It is designed to be very flexible and allows customization for any application where speech recognition is needed.