...The downloads section at sourceforge will be kept up to date for the foreseable future.
Yacas is an easy to use, general purpose computer algebra system. It uses its own programming language designed for symbolic as well as arbitrary-precision numerical computations. The system comes with a library of scripts and extensive documentation.
Yagy (http://sourceforge.net/p/yagy) provides full yacas experience wrapped in a simple and intuitive graphical interface.
The fast, flexible, extensible, and easy to use C++ template class for creating your own customized math expression parser for both built-in and user-defined numerical data types. The parsed tree perform fast and can be used in multi-threaded OpenMP apps
JPNBF is best described as an extension on Urban Müller's Brainfuck Language which features output, input, addition, multiplication, devision, incremention, decremention, conditional looping and exponentation of cells (blocks of memory).
Tao is an object-oriented scripting language with automatic memory management. Tao provides text processing and numerical computation functionality. Moreover, Tao can be easily extended by writing your own dynamically loadable C++ modules.
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ruby-gsl is a port of the GNU Scientific Library (GSL) to the Ruby programming language. The GNU Scientific Library is a collection of routines for numerical computing. Ruby is an interpreted scripting language for quick and easy object-oriented programm
Algae is a programming language for numerical analysis. We wrote it because we needed a fast and versatile tool, capable of handling large systems. Algae has been applied to interesting problems in aerospace and related fields for more than a decade.
Esla is a very simple C++ scripting language that can be embedded within an application or a numerical code. New language keywords can easily be programmed and added to the core language.
RLaB is a high level programming language targeted at engineering applications. Rlab is _not_ a clone of languages like Matlab. Though, it can be called "MATLAB-like" since the programming language possesses similar operators and concepts.