Alexa Skills Kit (ASK) is a collection of resources for developing Alexa, the Amazon Echo Device's voice service. Use ASK to increase Alexa's capabilities. Develop skills like playing music, setting an alarm, or having a simple conversation with Alexa. See the project documentation to find information on setting up a cloud based service (AWS Lambda), handling requests from Alexa, and extensive code samples.
If it's speech-to-text services you're after, Vocapia Research is in the game, offering a variety of speech technology services and working with their clients to adapt, fine tune or create products that are relevant for specific applications. One of Vocapia's products is the VoxSigma speech-to-text software suite that is suitable for many languages and a variety of audio data types. The VoxSigma API is available as a Web service via a REST API over HTTPS.
Ten APIs have been added to the ProgrammableWeb directory in categories including Natural Language Processing, Writing, Security, and Games. A highlight today is the AYLIEN News API which provides access to news content and data. Here's a summary of what's new for developers.