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AeroCalc AeroCalc is a python package that performs various aeronautical engineering calculations. Currently, it contains the following main modules:

• airspeed
• default_units
• ssec
• std_atm
• unit_conversion

Asymptote 'Asymptote' is a script-based vector graphics language for technical drawing, inspired by MetaPost but with an improved C++-like syntax. It provides for figures the same high-quality level of typesetting that LaTeX does for scientific text. It is a programming language, not just a graphics program, so it can use the best features of both scripts and GUIs. High-level graphics commands are implemented in the language itself, so they can be tailored to specific applications. Labels and equations are typeset with LaTeX for high-quality PostScript output.

Avogadro Avogadro is an advanced molecule editor and visualizer designed for cross-platform use in computational chemistry, molecular modeling, bioinformatics, materials science, and related areas. It offers flexible high quality rendering and a powerful plugin architecture.

• International: Translations into Chinese, French, German, Italian, Russian, Spanish, and others, with more languages to come.
• Intuitive: Built to work easily for students and advanced researchers both.
• Fast: Supports multi-threaded rendering and computation.
• Extensible: Plugin architecture for developers, including rendering, interactive tools, commands, and Python scripts.
• Flexible: Features include Open Babel import of chemical files, input generation for multiple computational chemistry packages, crystallography, and biomolecules.

BKchem BKchem is a chemical drawing program written in Python. It is platform independent.

Biskit Biskit is a python library for structural bioinformatics research. It simplifies the analysis of macromolecular structures, protein complexes, and molecular dynamics trajectories and offers a platform for the rapid integration of external programs.

BlockCanvas The BlockCanvas project provides a visual environment for creating simulation experiments, where function and data are separated. Thus, you can define your simulation algorithm by visually connecting function blocks into a data flow network, and then run it with various data sets (known as "contexts"); likewise, you can use the same context in a different functional simulation. The project provides support for plotting, function searching and inspection, and optimization. It includes a stand-alone application that demonstrates the block-canvas environment, but the same functionality can be incorporated into other applications. The BlockCanvas project relies on included libraries that allow multiple data sets using Numeric arrays to be incorporated in a Traits-based model in a way that is simple, fast, efficient, and consistent.

C-Graph GNU C-Graph is a tool for visualizing the mathematical operation of convolution underlying natural phenomena susceptible to analysis in terms of engineering signals and systems theory. "C-Graph" is an abbreviation for "Convolution Graph". The package is derived from the BSc. Honours dissertation in Electrical Engineering "Interactive Computer Package Demonstrating: Sampling Convolution and the FFT", Adrienne Gaye Thompson, University of Aberdeen (1983). The package computes the linear convolution of two signals in the time domain then compares their circular convolution by demonstrating the convolution theorem. Each signal is modelled by a register of discrete values simulating samples of a signal, and the discrete Fourier transform (DFT) computed by means of the Fast Fourier Transform (FFT). GNU C-Graph is interactive, prompting the user to enter character or numerical values from the keyboard, dispensing with the learning curve for writing code. The software will be useful to students of signals and systems theory. C-Graph is written in contemporary Fortran. You can find pre-GNU development versions at: <http://codeartnow.com/code/download/c-graph-1/c-graph-version-2-preview>. Adrienne Gaye Thompson is the sole author of GNU C-Graph and looks forward to sharing further development with the FLOSS community.

CAGE A generic and fairly complete cellular automata simulation engine. CAGE is a fairy generic and complete cellular automaton simulation engine in Python. It supports both 1D and 2D automata, a variety of prepackaged rules, and the concept of "agents" which can move about independently on the map for implementing agent behavior. CAGE comes with numerous examples of fully-functional CA systems, including Conway's Game of Life, Langton's self-reproducing automaton, Langton's "vants," and 1D automata rule explorers. It also comes with simple displayers (including a curses interface for 2D automata). Also included is a unique implementation of a finite state machine (ant.py).

CCVisu The tool CCVisu is a light-weight tool for force-directed graph layout. The tool reads the input graph from a file in RSF (Rigi Standard Format), which is a standard text format for relations. The layout of the graph is computed using standard techniques from force-directed layout. The tool supports several energy models, which can be selected by setting command line parameters. The weighted edge-repulsion LinLog energy model (default) is good for producing layouts that fulfill certain clustering criteria. The Fruchterman Reingold energy model is good for producing layouts that fulfill certain esthetic criteria like uniform edge length. CCVisu stores the resulting layout in certain text file formats such as VRML or SVG, or it displays the layout on the screen.

CERTI CERTI is an HLA RTI. HLA (High-Level Architecture) is a general purpose architecture for distributed computer simulation systems. In HLA systems, the RTI (RunTime Infrastructure) manages data exchange between simulations. CERTI focuses on HLA 1.3 specification and its C++ API (IEEE 1516 will be supported too).

Chaco Chaco is a software for partitioning graphs mainly intended for parallel computing and scientific simulations. It implements a set of algorithms for this task ranging from a generalization of KL/FM with weighted graphs support to the premiere multilevel algorithms which combine high quality partitioning schemes and low computational costs.

CoaSim 'CoaSim' is a tool for simulating the coalescent process with recombination and gene conversion under the assumption of exponential population growth. It constructs the ancestral recombination graph for a given number of individuals and uses this to simulate samples of SNP and micro-satellite haplotypes/genotypes. The generated sample can afterwards be separated in cases and controls, depending on states of selected individual markers. The tool can accordingly also be used to construct cases and control data sets for association studies.

CoaSim-gui 'CoaSim-gui' is a graphical use interface for the coalescence process simulator CoaSIm.

Coin Coin is a platform-independent retained-mode 3D graphics library that uses scene-graph data structures to render real-time graphics+suitable for mostly all kinds of scientific and engineering visualization applications. It is fully compatible with Open Inventor 2.1. Coin is built on the OpenGL immediate-mode rendering library, adds abstractions for higher-level primitives, provides 3D interactivity, increases programmer convenience and productivity, and contains optimization features for fast +rendering that are transparent for the application programmer.

EMAN EMAN is a scientific image processing suite designed mainly to perform single-particle reconstructions of individual molecules. In this method, a transmission electron microscope is used to collect images of thousands of individual molecules. A complex series of algorithms then turns the individual 2D images into a high-resolution 3D structure of the molecule. The core of EMAN is a C++ based scientific image processing library.

Earth3D Earth3D visualizes the earth in realtime in a 3D view. You can rotate and zoom the view until countries, cities and even single houses become visible (in areas where the necessary map resolution is available), and fly around. You can also embed external data like current earthquake positions or cloud data. Additional data layers can be added to the view, e.g. country flags and names. The package uses data from NASA, USGS, the CIA, and the city of Osnabrück. The data is loaded on demand over the Internet.

Elfelli Flux Line Simulator Elfelli is a tool to simulate and visualize electric flux lines around arbitrarily positioned, electrically charged bodies. It is able to export PNG files of the current canvas. It is written in C++ and uses gtkmm.

Elmer Elmer includes physical models of fluid dynamics, structural mechanics, electromagnetics and heat transfer. These are described by partial differential equations which Elmer solves by the Finite Element Method (FEM). Elmer comprises of several different parts: The geometry, boundary conditions and physical models are defined in ElmerFront. The resulting problem definition is solved by ElmerSolver. Finally the results are visualized by ElmerPost. Additionally a utility ElmerGrid may be used for simple mesh manipulation. The different parts of Elmer software may also be used independently. The strongest of the components is ElmerSolver which includes many sophisticated features. For pre- and postprosessing the users may find also other alternatives. The software runs on unix and windows platforms and can be compiled on a large variety of compilers. The solver can also be used in parallel mode on platforms that support MPI.<\p>

Engauge 'Engauge' converts an image file showing a graph or map into numbers. The image file can come from a scanner, digital camera or screenshot. The numbers can be read on the screen, and written or copied to a spreadsheet. The process starts with an image file containing a graph or map; The final result is digitized data that can be used by other tools such as Gnumeric. Its features include automatic grid line removal, point matching, and curve tracing; the ability to handle cartesian, polar, linear and logarithmic graphs; image processing that highlights data by removing grid lines and backgrounds; context sensitive help; and preview windows that give immediate feedback while modifying various settings.

Eonums Eonums is a simple module providing conversion between normal integer numbers and the corresponding textual expression in the Esperano language. It was mainly developped in order to explore the regularity of Esperanto expressions for big integer numbers. Names for 10**k (k = 6, 9, 12, ...) like "miliono" (10**6) or "miliardo" (10**9) are chosen from the so-called "Longa Skalo" as described on this page about big numbers (in Esperanto). The integer numbers eonums can convert to or from such Esperanto expressions can be arbitrarily large, but are limited in practice by the largest number for which there is a name in Esperanto (on the "Longa Skalo")", which is, on the previous page, 10**63 (dekiliardo). Hence, the largest integer you can handle with this module is 10**66 - 1. (This module makes no attempt to extend the Esperanto naming rules by introducing names like "undekiliono", "undekiliardo", "dudekiliono" etc.) This module can be fully translated automatically to Python 3.0 using its migration tool named 2to3. Features

• convert Python integers to Esperanto integer strings (Unicode)
• convert Esperanto integer strings (Unicode) to Python integers
• validate Esperanto integer strings (Unicode)
• handle integers from 0 to 10**66 - 1
• provide conversion functions and command-line scripts
• provide a Unittest test suite
• can be automatically migrated to Python 3.0 using 2to3