Alexicom AAC - Communication App available for IOS (iPad & iPhone) and Android, with external switch support.

ChoicePad Lite is an iPad App that features Makaton symbols.

Gabby - A cheap, yet effective communication App for the iPad, iPhone and iPad Touch

Grid Player - iPad App from the makers of The Grid 2, bringing their take on a communication App to the tablet market.

Locabulary Pro - Communication App for iPad, Android and Nintendo DS that communicates phrases from within categories and utilises location services.

MyVoice communication App for the Apple iPad, iPhone, iPod Touch and Android devices. Scrolling communication aid that adapts to your location.

Predictable - Communication app for the iPad/iPhone/iPod Touch that also supports switch users

Proloquo2Go is a well thought out, comprehensive communication app for the iPad and iPhone to mimic a communication aid.

Say Hi - Free simple select and speak communication App for iPad, iPhone and iPod Touch.

Sono Flex - Communication App by the communication device specialists Tobii