I’m working on a free version of Lisgo now.
Please register your email here, so you will be notified when it’s available.
http://free.lisgo.org/

*No spam!, you will be notified just before it’s out.

Acapela voice team told me that they will add Japanese voices next year. If you are interested in Japanese support on Lisgo, and want to be notified when it’s available, please register your email here.
http://jp.lisgo.org/

*Not only Japanese, I will add multiple language supports for Lisgo when the basic feature of Lisgo is ready!

*Update
The free version got rejected by apple, and I am working on to release it again.