Thunkable - Powerful but easy to use, drag-and-drop mobile app builder.
Google App Engine - A powerful platform to build web and mobile apps that scale automatically.
MIT App Inventor - App Inventor is a cloud-based tool, which means you can create apps for phones or tablets right in your web browser.
Dokku - Docker powered mini-Heroku in around 100 lines of Bash
Bubble.io - Building tech is slow and expensive. Bubble is the most powerful no-code platform for creating digital products.
Google Cloud Functions - A serverless platform for building event-based microservices.