Lernout & Hauspie TruVoice TTS engine (free voices):

American English (1 MB)

British English (2.5 MB)

Dutch (2.6 MB)

French (2.2 MB)

German (2.2 MB)

Italian (2 MB)

Japanese (3 MB)

Korean (3 MB)

Portuguese (Brazil) (2.4 MB)

Russian (2.9 MB)

Spanish (2.4 MB)