Alexa Skill Kit - Effortless Alexa Skill development with AWS Lambda
Jovo - 🗣 Build cross-platform apps for Alexa and Google Home
Alexa for Business - Using Amazon Alexa’s voice enabled devices for workplaces
Voiceflow - Build voice apps in your browser without coding
BotTalk - Create Alexa skills and Google Assistant actions with Markup
Alexa Skill Builder by Chatamo - Build your own Alexa skills for free (no code required)!