[fleXive] is a JavaEE 5 open source (LGPL 2.1 or higher) framework for the development of complex and evolving (web-)applications. It speeds up development by easing many tedious and repetitive programming tasks and helping to keep your application(s) flexible during the development-cycle and in production.
Based on the latest industry-standards like EJB 3, JSF, etc. [fleXive] should be your choice for building up your own new application.
Hm. RAD environment with Swing GUI, no downloads yet (2008-08-18), uses an proprietary scripting language, only the Enterprise Edition (2.2 K $) allows to use the Java API. Targeted customer group seems to be procedural developers. What sort of Java product should that be where you need to mention that you can write your own classes??? doesn't seem to use the Java EE API, would be interesting if the "ObjectScript" is interpreted or bytecode.
IMHO too proprietary, goes into the wrong direction for bigger enterprises.
10gen is a new platform-as-a-service technology designed to help developers quickly and easily build dynamic, scalable, mission critical web sites and applications.
The 10gen software stack is analogous to Google App Engine in that it provides a new stack of tools (database, grid management, application server) that are purpose-built to run in a cloud environment.