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.
Astra by Cesbo - Talk to Alexa anywhere, from your iPhone
LiveCode Platform - It is Both Under the GPL and it is also Proprietary if using the GPL version the software you make...
Reverb - Use Alexa on your Mac, iPhone and Android
Redis - Redis is an open source in-memory data structure project implementing a distributed, in-memory key-value database with optional durability.
Amazon Blueprints - Create your own Alexa Skill in minutes