Lexi - Speak to Alexa through your iPhone
Voiceflow - Build voice apps in your browser without coding
Astra by Cesbo - Talk to Alexa anywhere, from your iPhone
Alexa Skill Kit - Effortless Alexa Skill development with AWS Lambda
Ava - Making conversations accessible for the deaf
API to bot - Convert your API to Alexa skill or Google Home app in 5 mins