Here you have a compilation of some excellent alternatives to go from text to speech.
1- Vozme allows the change of text to speech in multiple languages, including Spanish and Catalan. Voice me generate an MP3 file with your text translated into speech and you can download it to your computer for free.
2- RoboVoice allows us to listen to the web pages. Its use is very easy, we open the page that we want to listen to and voila, RoboVoice will begin to reproduce the text that is on that page.
3- Text to Voice is an addon for Firefox that allows us to select any text from a website and listen to it. To use it, we select the text to listen to and click on the button in the lower right.
The result of the translation can be downloaded in audio for free.
4- BlindSpeak allows us to send audio messages anywhere in the world.
5- Dragon Dictation does the reverse process. It is a speech recognition application. Allow us to talk easily and instantly send our messages by email, iPad, iPhone or iPod touch.
6- Odiogo allows us to convert our website or blog into a high quality audio file. It is compatible with blog engines that publish RSS such as Typepad, Blogger, WordPress or Overblog. In addition, all the files created will be stored for free on their servers.
7- PediaPhon allows us to create MP3 files, playlists or Podcasts automatically from Wikipedia articles.
8- BlogRadio allows us to listen to our favorite blogs, at home, in the office, or anywhere. To use Blog Radio you must first download its Adobe AIR application, when you have it installed, subscribe to your favorite blogs and then we will convert the blog’s text into an audio file.
9- SpokenText.net allows us to record PDF, Word, plain text, PowerPoint, RSS news feeds, emails and web pages, and automatically convert them to speech.
I invite you to increase the list in the comments.