Voiceflow - Build voice apps in your browser without coding
Lexi - Speak to Alexa through your iPhone
Alexa Skill Kit - Effortless Alexa Skill development with AWS Lambda
Voice Principles - Guiding principles for voice design, all in one place
API to bot - Convert your API to Alexa skill or Google Home app in 5 mins
BotTalk - Create Alexa skills and Google Assistant actions with Markup