Android
Symbol-based
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Verbo 2 (requires a commercial licence)
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JoComunico: requires an internet connection.
Text-based
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Asistente de voz AAC
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Synthesised voices for Android
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Acapela TTS Voices: synthesised voice store
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Veu TTS Vocalizer (Catalan): synthesised voice store
You can find more apps, mainly in English, at: