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4tH 4tH is a Forth compiler with a little difference. Instead of the standard Forth engine it features a conventional compiler. 4tH is a very small compiler that can create bytecode, C-embeddable bytecode, standalone executables, but also works fine as a scripting language. It supports about 95% of the ANS Forth CORE wordset and features conditional compilation, pipes, files, assertions, forward declarations, enumerations, structures, suspended execution, recursion, include files, etc. It comes with an RPN calculator, line editor, preprocessor, compiler, decompiler, C-source generator, a virtual machine, and a multitasking environment.

A Bingo Rails A/B testing. One minute to install. One line to set up a new A/B test. One line to track conversion.

A+ A+ is a powerful and efficient programming language. It has a rich set of functions and operators, a modern GUI with many widgets and automatic synchronization of widgets and variables, asynchronous execution of functions associated with variables and events, dynamic loading of user compiled subroutines, and many other features. Execution is by a rather efficient interpreter. It is mainly used in a computationally-intensive business environment, but many critical applications written in A+ have withstood the demands of real world developers over many years. It is written in an interpreted language, so applications tend to be portable.

ACDK ACDK is a development framework with a similar target of Microsoft's .NET or Sun's ONE platform, but instead of using Basic/C# or Java as programming language, it bases C++ as core implementation language. ACDK implements the standard library packages, including acdk::lang, acdk::lang::reflect, acdk::util, acdk::io, acdk::text (including regexpr), acdk::net, acdk::sql, acdk::xml and more, as well as technologies like flexible Allocator/Garbage Collection, Threading and Unicode. With the extensions of ACDK C++ objects are available for reflection, serialization, aspect oriented class attributes and [D]ynamic [M]ethod [I]nvocation. This DMI act as an universal object oriented call interface to connect C++ with scripting languages (Java, Perl, Tcl, Python, Lisp, Visual Basic, VBScript) and standard component technologies (CORBA, COM+).

ACL2 ACL2 is a mathematical logic and a mechanical theorem prover to help you reason in the logic (which is a subset of applicative Common Lisp). The theorem prover is an ``industrial strength version of the Boyer-Moore theorem prover, Nqthm. Users can build models of all kinds of computing systems in ACL2, just as in Nqthm, even though the formal logic is Lisp. Once you've built an ACL2 model of a system, you can run it and use ACL2 to prove theorems about the model.

AGFL AGFL is a parser generator for natural languages. It can cope with ambiguity, which is a must for natural languages, has a lexicon system and is quite fast. If you don't know what to think of it, think "yacc" (or "bison") without shift-reduce conflicts.

AKFAvatar AKFAvatar is a fancy graphical user interface for applications, where an avatar appears on the screen and tells things to the user via a speech bubble. There can also be recorded audio files, so that the user even can hear what it is saying.

With AKFAvatar you can easily write cross platform applications in Lua. Lua scripts don't even need to be compiled for the target platform. It has an interface for C programs, which can also be used for Objective-C or C++. Furthermore there are bindings for Free Pascal and GNU-Pascal.

ARts 'aRts' is a framework for developing modular multimedia applications. The sound server, artsd, lets multiple applications cooperatively process and output sound and music. aRts provides its filter and synthesis capabilities to other applications using the multimedia communication protocol (MCOP). The package is also capable of modular realtime synthesis. It can create sounds & music (realtime midi synthesis) using small modules like oscillators for creating waveforms, various filters, mixers, faders, etc. As of Dec 02, 2004, development on this project has been discontinued.

AVFS A Virtual File System lets programs look inside archived or compressed files, or access remote files without recompiling the programs or changing the kernel. It currently supports floppies, tar and gzip files, zip, bzip2, ar and rar files, ftp sessions, http, webdav, rsh/rcp, ssh/scp. Quite a few other handlers are implemented with the Midnight Commander's external FS.

Aap The Aap program executes recipes. It is a kind of super-make program. In a recipe you describe how to perform a certain task. Like a Makefile it contains dependencies and build commands. Additionally, many powerful features are included, so that you can use a recipe to:

• Build a program by just specifying the program name and the source files
• Maintain a web site (the A-A-P site is generated and uploaded with a recipe)
• Download the latest version of files
• Distribute files to several servers at once
• Obtain a module from CVS
• Commit changes to CVS; add and remove files automatically
• Generate and filter files
• Build several variants and on multiple platforms with little effort

Aardvark Shellutils The Aardvark Shell Utils collection includes the following three utilities:

Realpath- implementation of the 'realpath' function for returning
the canonicalized absolute pathname of an input path. This
generates an absolute pathname with all symlinks resolved and all
'.' and '..' characters removed. Many commands do not work well
with relative paths or paths containing symlinks. Realpath
resolves these absolute paths.

Filebase- returns the base portion of a filename, that is the
filename with its extension (e.g. .txt) removed. It returns
everything preceeding the last period in the input string. The
period itself is not returned.

Fileext- returns the extension portion of a filename
(e.g. txt). It returns everything following the last period in the
input string. The period itself is not returned.

Aasm Aasm is an advanced assembler designed to support several target architectures and output file formats using plugins. It has been designed to be easily extended and, should be considered as a good alternative to monolithic assembler development for each new target CPUs and binary file formats.

Access user Class Access_user Class is an easy to use system for protecting pages and register users. They main features are: User-login, user registration, user update, remember login information, page protection, forgotten password recovery, mail based account activation and multi language message reporting and since the latest versions: maintain extra user profile information, access levels, a limited (safe) admin panel, manual account activation and an improved password check. The class is powered by MySQL and PHP sessions. Inside the package are examples for all primary methods.

Acovea ACOVEA (Analysis of Compiler Optimizations via an Evolutionary Algorithm) implements a genetic algorithm to find the "best" options for compiling programs with the GCC C and C++ compilers. "Best" is defined as those options that produce the fastest executable program from a given source code. Acovea can also be extended to test other programming languages and non-GCC compilers.

Action Mailer Action Mailer is a framework for designing email-service layers. These layers are used to consolidate code for sending out forgotten passwords, welcome wishes on signup, invoices for billing, and any other use case that requires a written notification to either a person or another system. Additionally, an Action Mailer class can be used to process incoming email, such as allowing a weblog to accept new posts from an email (which could even have been sent from a phone).

Action Query jQuery and ActiveRecord, sitting in a tree...

Active Resources Active Resource attempts to provide a coherent wrapper object-relational mapping for REST web services. It follows the same philosophy as Active Record, in that one of its prime aims is to reduce the amount of code needed to map to these resources.

Acts as Audited acts_as_audited is an Active Record plugin that logs all modifications to your models in an audits table. It uses a polymorphic association to store an audit record for any of the model objects that you wish to have audited. The audit log stores the model that the change was on, the “action†(create, update, destroy), a serialzied hash of the changes, and optionally the user that performed the action.

Acts as fu When you need a dash of ActiveRecord and nothing more. Now you have no excuse for not test-driving your ActiveRecord extending plugins.

Ada Components A component library for the Ada language. The four main categories are data structures, math, Ada programming tools, and OS interface.