Jovo - 🗣 Build cross-platform apps for Alexa and Google Home
OK Google - Explore over 150 Google Now voice commands in one place
API to bot - Convert your API to Alexa skill or Google Home app in 5 mins
Actions on Google - The open platform for Google Assistant
BotTalk - Create Alexa skills and Google Assistant actions with Markup
Subcast - Podcasts as simple as radio.