Alexa Skill Kit - Effortless Alexa Skill development with AWS Lambda
Bespoken Tools - Bespoken makes it easy to develop for Alexa, Google Home and Chatbots.
BotTalk - Create Alexa skills and Google Assistant actions with Markup
OK Google - Explore over 150 Google Now voice commands in one place
Effct - SAAS platform to help you publish audio content on Alexa
Actions on Google - The open platform for Google Assistant