- ASCEND IV is an object-oriented mathematical modeling environment, with similar functionality to programs such as GAMS, AMPL, Aspen, or Dymola. If can be used to solve difficult non-linear systems of equations and to plot dynamic behaviour of such systems. Although ASCEND has primarily been developed by Chemical Engineers, great care has been exercised to assure that it is domain independent. ASCEND can support modeling activities in fields from Architecture to (computational) Zoology.
- 'Accessibility' means enabling people with disabilities to participate in substantial life activities that include work and the use of services, products, and information. GNOME Accessibility is the suite of software services and support in GNOME that provides accessibility interfaces to other applications and toolkits.
- ATLAS (Automatically Tuned Linear Algebra Software) is a system for generating high-performance mathematical libraries. It generates a library that is specifically tuned to your processor and compiler. ATLAS's purpose is to provide portably optimal linear algebra software. In particular, ATLAS provides ANSI C and Fortran 77 interfaces to the BLAS, and a subset of LAPACK.
- ATM SAR Library (SARLib)
- SARLib can be used as an AAL5 ATM Segmentation and Reassembly engine.
- AVbin is a thin wrapper around FFmpeg, providing binary compatibility for applications and languages that need it. FFmpeg is a collection of audio and video codecs widely used in projects such as mplayer, xine, gstreamer and VLC. It is under continuous development; so much so that its developers rarely provide a release, and SVN snapshots of the library must be statically linked to avoid version incompatibilities. AVbin allows programs that require dynamic linkage to use FFmpeg. It does this by providing:
- an accurate version number within the shared library, allowing applications to select the appropriate data structures and functions to use at runtime, and
- a simplified interface with an unchanging ABI to the most common decoding functionality within FFmpeg.
- AVbin is distributed as a single dynamic library (.so on GNU/Linux, .dylib on Mac OS X, and .dll on Windows) that depends on no other files or installations. This eliminates the many complexities of building FFmpeg on platforms other than GNU/Linux; however you can still build it from source if you prefer.
- 'Aalib' is a low level gfx library that works on any kind of terminal. It does not require graphics devices (in fact, no graphical output is possible), and is particularly useful for those with older hardware who do not want to worry about overloading their systems with graphical applications.
- 'abclock' gives a spatial representation of time. It isn't tied to the design of a mechanical clock, but instead uses the natural properties of bitmaps: straight lines and rectangles. The clock uses ordinary hours and minutes. Placement and movement of objects is analogous to mechanical clocks. Time has a symmetrical property that is reflected in the way time changes in this clock. It is clear and exact up to parts of minutes, even when the bitmap is very small.
- Achievo ATK
- Achievo ATK is an object oriented Web-application Framework, written in PHP. It is targeted at developers who wish to focus on business logic, instead of coding HTML. Where other application frameworks mainly provide a large set of utility classes, ATK provides a complete framework that requires only small amounts of code to get usable applications, while maintaining full flexibility. It is currently the back-end software for the 'achievo' project management/project tracking tool.
- Ad-hoc Support Library
- Ad-hoc Support Library (ASL) is a user-space library which provides an API to faciliate implementation of routing protocols for wireless ad-hoc networks in GNU/Linux.
- Ada Components
- A component library for the Ada language. The four main categories are data structures, math, Ada programming tools, and OS interface.
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