TTSBuilder allows engineers to create their own Text To Speech Voice or Language using High Quality Open Festival Speech Synthesis Research. A complete step-by-step manual for such a creation is included in the retail version.
The evaluation version has one such British Voice created using the mentioned step-by-step techniques. The TTSBuilder converts the heavy technical research oriented documentation into one simple practical guide, all you require to do is follow the steps.
Not to mention all required libraries for Windows are included. This is an Research Lab attempt to bring speech synthesis to basic developers.