Microsoft Office Access - Access is now much more than a way to create desktop databases. It’s an easy-to-use tool for quickly creating browser-based database applications.
Voiceflow - Build voice apps in your browser without coding
LiveCode Platform - It is Both Under the GPL and it is also Proprietary if using the GPL version the software you make...
Alexa Skill Kit - Effortless Alexa Skill development with AWS Lambda
Redis - Redis is an open source in-memory data structure project implementing a distributed, in-memory key-value database with optional durability.
API to bot - Convert your API to Alexa skill or Google Home app in 5 mins