ICEfaces is a framework for developing Ajax applications for the Web and iPhone in Java with JavaServer Faces. In contrast to typical Web applications, ICEfaces applications can update any part of the page at any time. Full page refresh is eliminated, and multi-user interaction is supported through AJAX Push.
Zbatery is an HTTP server for Rack applications on systems that either do not support fork(), or have no memory (nor need) to run the master/worker model. It is based on Rainbows! (which is based on Unicorn (which is based on Mongrel)) and inherits parts of each. Zbatery supports your choice of all the thread/fiber/event/actor-based concurrency models and Rack middleware that Rainbows! supports (or will ever support) in a single process. Zbatery will still exploit certain features of Unix for transparent upgrades, log reopening, and graceful stops, but does not rely on them for basic functionality.