iText2Speech.com is an online free web based text to speech tool which does convert any given text to speech and allows you to save or download the audio file in the format like .wav, .mp3, .aac, .ogg and .caf. The tools is very user friendly and it generates the audio file real quick.
To use the tool -
Enter your text > Select one language > Select one audio format > Click on play > Listen and Download the resulting audio file in the format you choose.
The following languages are supported from text to speech: