Shareware Digalo Text-To-Speech engine www.digalo.com - US English, British English, German, French, Castillian,
Spanish, Italian, Brazilian, Portuguese, Russian, Polish, Latin American Spanish.
You can install on your desktop both Speech API 5.1 and Speech API 4.0. LearnWords supports Speech API 5.1 and Speech API 4.0.
If you want to use the voice engine to Speech API 4.0 then check a tag
"Use old Speech API 4" (see "Options \ Sound")