Astra by Cesbo - Talk to Alexa anywhere, from your iPhone
Jovo - 🗣 Build cross-platform apps for Alexa and Google Home
Reverb - Use Alexa on your Mac, iPhone and Android
Alexa Skill Kit - Effortless Alexa Skill development with AWS Lambda
Amazon Blueprints - Create your own Alexa Skill in minutes
Voiceflow - Build voice apps in your browser without coding