Design Principles - An open source repository of design principles and methods
Alexa Skill Kit - Effortless Alexa Skill development with AWS Lambda
Facebook Design Resources - A collection of free resources made by designers at Facebook
BotTalk - Create Alexa skills and Google Assistant actions with Markup
Facebook - Connect with friends, family and other people you know. Share photos and videos, send messages and get updates.
Actions on Google - The open platform for Google Assistant