Vertabelo - Online tool for visual database design.
10Duke SDK - A rapid application development kit for creating new online applications. Dramatically reduce development times from months to weeks.
Longtion Application Builder - Longtion Application Builder is a tool for designing and developing database applications and Web...
Invantive Studio - Powerful software development environment
Navicat Data Modeler - Navicat Data Modeler allows users to create a conceptual model from an existing database and edit the structure of the database easily.
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.