A Simple Version Control System is an easy to install and easy to to use version/revision control system. It differs from most other version control systems in that it is designed to keep track of files in place. It does not allow any changes to be made to files; all changes require the users to change files externally with FTP or SSH access. It is very easy to set up and use. Users do not need to work with repository, branches, commit, and check-out files. All a user needs to do is upload the changes files and click Update, or if enabled, just wait for it to be updated automatically.
AEditor is a programmer's editor for Windows, Unix, and Mac OS X that relies on the fox toolkit. It can do syntax coloring of Ruby and C++ files. It's easy to change the color theme. Most things are customizable. It is written in Ruby and is carefully unit-tested (it has 421 tests). It is written in only ~5500 lines of code, so it should be easy to grasp and extend.
AIOTrade (i.e. Humai Trader Platform) is a stock technical analysis platform with a pluggable architecture that is ideal for extensions such as indicators and charts. It supports parallel quote data retrieval from Yahoo! or ASCII text files, historical (daily, weekly, and monthly), intra-day, and real-time charts, and candle, bar, and line charts. It has a calendar date/trading date view model. "MACD", "OBV", "ROC", "KD", "BIAS", "DMI", "RSI", "MTM", and "WMS" indicators and drawing of "Line", "Parallel", "Gann Angle", and "Fibonacci Line" are supported. You can easily write your own indicators.
AJAX Tree Control is a modified version of SilverStripe's tree control. It adds dynamic loading of child nodes via AJAX. The default implementation uses the prototype library to make dynamic requests, but this behavior can be overridden by setting functions on the global Tree object. There are a few demo Ruby on Rails applications included in the distribution that show how to use and customize the tree.
APIlity Agua is an AJAX application that allows users to manage their Google AdWords accounts in an interactive and asynchronous way. The application behaves almost like a program on your desktop, but runs entirely in your Web browser. The name Agua stands for APIlity GUI for AdWords.