Appsta is designed to make bootstrapping new Rails applications much easier. It provides a helper library for writing Rails templates, to quickly setup your projects on Heroku, GitHub, and other things to get your app up and running quickly.
ARP is an Open Source Pattern-Based Rich Internet Application (RIA) Framework for the Flash Platform. ARP currently supports Macromedia® Flash® and Flex™-based RIA Development in ActionScript 2 and ActionScript 3.
Atmosphere is a POJO based framework using Inversion of Control (IoC) to bring push/Comet and Websocket to the masses! Finally a framework which can run on any Java based Web Server, including Tomcat, Jetty, GlassFish, Weblogic, Grizzly, JBossWeb and JBoss, Resin, etc. without having to learn how Comet or WebSocket support has been differently implemented by all those Containers. The Atmosphere Framework has both client (JQuery PlugIn) and server components.