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

Appium is an open source test automation tool for use with native and hybrid mobile apps. It drives iOS and Android apps using the WebDriver JSON wire protocol. Appium aims to automate any mobile app from any language and any test framework, with full access to back-end APIs and DBs from test code.

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.

Unit testing asserts can be difficult to use. Approval tests simplify this by taking a snapshot of the results, and confirming that they have not changed.

AppScale is a platform that allows users to deploy and host their own Google App Engine applications. It executes automatically over Amazon EC2, Google Compute Engine, Rackspace, Eucalyptus, CloudStack, OpenStack, as well as Xen, VirtualBox, VMWare, and KVM. It has been developed and is maintained by AppScale Systems, Inc., in Santa Barbara, CA. It supports the Python, Java, PHP, and Go Google App Engine platforms.

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.

an Automated Pythonic Code Tester. This package is designed to run tests on a code repository on a daily basis. It comes with a set of predefined test, essentially for python packages, and a set of predefined reports to display execution results. However, it has been designed to be highly extensible, so you could write your own test or report using the Python language.

Aqua is a new Ruby library that aims to painlessly persists objects, allowing developers to focus more on object oriented code and less on storage.

An open-source database with a flexible data model for documents, graphs, and key-values. Build high performance applications using a convenient sql-like query language or JavaScript/Ruby extensions.

Arbiter is a requirements gathering and acceptance testing tool for project managers and web developers, to help ease client interaction. The project specification can be defined in word processor format as you would normally. By adding some special items, such as titled bulleted lists and highlighted text items, both a test suite and glossary can be written right into the spec. The Arbiter server will parse these documents and run the tests, reporting the results into the documents themselves. This allows the client to see project process.

It also allows the developers, sitting next to the client, to add concrete executable examples of the use cases. This adds clarity and helps to settle disputes over required functionality. Using the glossary, developers can signal to the client that concepts are not well understood. Tests can be marked pending if a document contains unexplained glossary items.