Web Speech: Synthesis & Recognition

"smart" agents like Siri, Cortana, Alexa are not the only tools that can "talk".
Even web applications, with help of JavaScript APIs exposed by browsers and server-side APIs
can both synthesize and recognize voice.

Getting Started with the Speech Synthesis API - Treehouse Blog (works in Chrome)

CodePen - Web Speech Synthesis Demo

hiddentao/google-tts: Javascript API for the Google Text-to-Speech engine

Text to Speech @ IBM Bluemix Watson Developer Cloud (Chrome & Firefox)

ResponsiveVoice.JS
"Instant Text-To-Speech with Voice Consistency Across Devices"

Accepting Speech Input in HTML5 Forms - Treehouse Blog

Microsoft Cognitive Services

Microsoft Cognitive Services - Bing Speech API
5,000 transactions per month Free
Speech to text Utterance up to 15 seconds $4 per 1000 transactions
Text to speech $4 per 1000 transactions

c# - Calling SpeechAPI for text to speech on Azure - Stack Overflow

Microsoft Cognitive Services - Computer Vision API (image OCR)

Windows speech APIs:

Speech | Context | Channel 9

Microsoft Speech API (SAPI) 5.3

Windows-universal-samples/Samples/SpeechRecognitionAndSynthesis at master · Microsoft/Windows-universal-samples @ GitHub

Speech Recognition and Speech Synthesis in Universal Windows Apps