The Dextop application framework allows you to create Rich Internet Applications based on .NET/Mono and Sencha Ext JS. It has proven to be useful for online business applications. It features a desktop-like Ext JS frontend, simplified client-server communication, a stateful programming model, real-time updates and notifications from the server, automatic column model generation, automatic store model generation, and automatic form generation.
DVelum is a professional development platform which aims at automating routine development tasks and facilitates programming by means of a graphical interface. The platform simplifies and accelerates the development process and allows for concentrating directly on the business logic, aside from low-level problems. This is not another CMS or framework, it is a platform for the development of systems with a complex internal structure, such as eCommerce, CRM, WebScada, etc., while the development of simple sites with its help is as easy and pleasant.
XEO (eXtensible Enterprise Objects) is an agile development framework designed for creating Web applications built around Object Oriented concepts and Model Driven Development with Java. You model business entities (including their attributes and behavior) as XEO Models which are then processed by the framework's "Builder". This produces the application's supporting structures such as database tables (to persist data) and Java classes (providing object-relational mapping and behavior). Development is supported by an Eclipse plugin called XEOStudio.