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

BoardMaker V6 - A flexible and powerful communication display maker. BoardMaker is a graphics database with 3,160 Picture Communication Symbols (PCS) in clip art form.

ChoicePad Lite is an iPad App that features Makaton symbols.

 

Clicker 6 is compatible with Clicker 5 grids and has built on the strengths of the previous versions.

Communicate: In Print 2 - A desktop publishing program for creating symbol-supported resources for printing.

Communicate: SymWriter - Word Processing with Symbols

FreeSpeech - A pretty good free communication App.

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.
 

Exciting new, cost effective way of communicating! This is definitely one of the hottest topics in the world of communication.