Thunkable - Powerful but easy to use, drag-and-drop mobile app builder.
OpenXava - OpenXava is a Web Java Framework for Rapid Development of Enterprise Applications.
Bubble.io - Building tech is slow and expensive. Bubble is the most powerful no-code platform for creating digital products.
Vaadin Framework - Vaadin is a web application framework for Rich Internet Applications (RIA).
BuildFire - BuildFire is the easiest way for small businesses to build a mobile app in a matter of minutes for iOS and Android.
Grails - An Open Source, full stack, web application framework for the JVM