It allows you create complete phrases based on prerecorded words and save them as audio files. It works great to create quick dialogs for your animation project and insert the audio file into it.
VoiceStitcher is very simple to use but very effective in the results:
1) Select one voice package. It would load all the words instances into your working panel.
2) Click on the words in the desired order and insert small silences if needed.
3) Press the Save button and you'll get the audio file for your animation.
And the most important, VoiceStitcher is free.
You can download VoiceStitcher and a voice pack demo from The VoicePlanet to play with it and learn how does it work.
Additional voice packs can be bought for a reasonable price from The VoicePlanet.
I think it worth to try.

-G