A framework to optimize ABC, SWC and SWF files. Apparat features include:
* Compression
* Code analysis
- UML diagram generation
- Bytecode flowgraph generation
- Static check for [Abstract] methods
- Detailed ABC information
- Code coverage instrumentation
- Typesafe trace() removal keeping side-effects
- ASMify existing code
* Optimization

Appcelerator is a next-generation, open source web platform. The Appcelerator Platform incorporates the best of RIA and SOA-based technologies and design principles into one fully-integrated solution

applitude is a runtime framework and a domain-specific language for iPhone application development. It is an extended, iPhone-only version of the Applause project.

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.

Archetype is designed to fill the gap that other frameworks and libraries leaves in the (script removed) Structure and ease of development.

AribaWeb is the Open Source component-based web application development framework for creating rich, AJAX-enabled applications with the absolute minimum of code (and no hand-coded Javascript).

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.

ASP-ajax bridges the gap - providing .Net Ajax style functionality and "Update Panels" to VBScript ASP. ASP-ajax also allows you to easily call any ASP server function from JavaScript and return results without refreshing the page. Lightweight, simple and fast - ASPajax is free.

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.

A minimalistic easy to setup .Net BDD story runner