OpenEars (http://www.politepix.com/openears) is the most popular free offline speech recognition/speech synthesis framework for iOS, and the core of the OpenEars Platform (http://www.politepix.com/openearsplatform), a plugin system letting you drag-and-drop new speech features into your app. Get started in just 5 minutes using the OpenEars Quickstart Tutorial (http://www.politepix.com/openears/tutorial). Now supports English & Spanish!
RapidEars (http://www.politepix.com/rapidears) is a plugin for OpenEars which performs live, offline speech recognition in realtime. So responsive it can even be used as a game input.
Rejecto (http://www.politepix.com/rejecto) is a plugin for OpenEars which lets OpenEars and RapidEars ignore speech that isn’t in the vocabulary.
NeatSpeech (http://www.politepix.com/neatspeech) is a plugin for OpenEars which adds improved voices which sound better & speak continuously without lag.