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The Visualization Toolkit (VTK) is an open-source, freely available software system for 3D computer graphics, image processing and visualization. VTK consists of a C++ class library and several interpreted interface layers including Tcl/Tk, Java, and Python. Kitware, whose team created and continues to extend the toolkit, offers professional support and consulting services for VTK. VTK supports a wide variety of visualization algorithms including: scalar, vector, tensor, texture, and volumetric methods; and advanced modeling techniques such as: implicit modeling, polygon reduction, mesh smoothing, cutting, contouring, and Delaunay triangulation. VTK has an extensive information visualization framework, has a suite of 3D interaction widgets, supports parallel processing, and integrates with various databases on GUI toolkits such as Qt and Tk.

CGAL is a collaborative effort of several sites in Europe and Israel. The goal is to make the most important of the solutions and methods developed in computational geometry available to users in industry and academia in a C++ library. The goal is to provide easy access to useful, reliable geometric algorithms. The CGAL library contains: * the Kernel with geometric primitives such as points, vectors, lines, predicates for testing things such as relative positions of points, and operations such as intersections and distance calculation. * the Basic Library which is a collection of standard data structures and geometric algorithms, such as convex hull in 2D/3D, (Delaunay) triangulation in 2D/3D, planar map, polyhedron, smallest enclosing circle, and multidimensional query structures. * the Support Library which offers interfaces to other packages, e.g., for visualisation, and I/O, and other support facilities.

numexpr - Fast numerical array expression evaluator for Python and NumPy. The numexpr package evaluates multiple-operator array expressions many times faster than NumPy can. It accepts the expression as a string, analyzes it, rewrites it more efficiently, and compiles it to faster Python code on the fly. It's the next best thing to writing the expression in C and compiling it with a specialized just-in-time (JIT) compiler, i.e. it does not require a compiler at runtime. Also, numexpr has support for the Intel VML (Vector Math Library) -- integrated in Intel MKL (Math Kernel Library) --, allowing nice speed-ups when computing transcendental functions (like trigonometrical, exponentials...) on top of Intel-compatible platforms. This support also allows to use multiple cores in your computations.

Scilab is a scientific software package for numerical computations in a user-friendly environment. Main features * Hundreds of mathematical functions * High level programming language * 2-D and 3-D graphics * Advanced data structures and user defined data types * Xcos: hybrid dynamic systems modeler and simulator 2-D and 3-D visualization * Lines * Pie charts * Histograms * Surfaces * Animations * Graphics export in many formats: GIF, BMP, JPEG, SVG, PDF... Numerical computation * Linear algebra * Sparse matrices * Polynomials and rational functions * Simulation: explicit and implicit systems of differential equations solvers * Classic and robust control * Differentiable and non-differentiable optimization Data analysis * Interpolation, approximation * Signal Processing * Statistics Extended features * Graphs and Networks * Interface with Fortran, C, C++, Java * Functions for calling Scilab from C, C++, Fortran and Java * LabVIEW Gateway * A large number of modules available via ATOMS

The SDPA (SemiDefinite Programming Algorithm) is a software package for solving semidefinite program (SDP). It is based on a Mehrotra-type predictor-corrector infeasible primal-dual interior-point method. The SDPA handles the standard form SDP and its dual. It is implemented in C++ language utilizing the LAPACK for matrix computation. The SDPA incorporates dynamic memory allocation and deallocation. So, the maximum size of an SDP to be solved depends on the size of memory which users' computers install. The SDPA enjoys the following features: 1. Callable library of the SDPA is available. 2. Efficient method for computing the search directions when an SDP to be solved is large scale and sparse. 3. Block diagonal matrix structure and sparse matrix structure in data matrices are available. 4. Some information on infeasibility of a semidefinite program to be solved is provided.

surf is a tool to visualize some real algebraic geometry: plane algebraic curves, algebraic surfaces and hyperplane sections of surfaces. surf is script driven and has (optionally) a nifty GUI using the Gtk widget set. The algorithms should be stable enough not to be confused by curve/surface singularities in codimension greater than one and the degree of the surface or curve. This has been achieved quite a bit. We have drawn curves of degree up to 30 and surfaces of degree up to 20 successfully. However, there are examples of curves/surfaces of lower degree where surf fails to produce perfect images. This happens especially if the equation of the curve/surface is not reduced. Best results are achieved using reduced equations. On the other hand, surf displays the Fermat-curves accurately for degree up to 98.

The Visualization Toolkit (VTK) is an open-source, freely available software system for 3D computer graphics, image processing and visualization. VTK consists of a C++ class library and several interpreted interface layers including Tcl/Tk, Java, and Python. Kitware, whose team created and continues to extend the toolkit, offers professional support and consulting services for VTK. VTK supports a wide variety of visualization algorithms including: scalar, vector, tensor, texture, and volumetric methods; and advanced modeling techniques such as: implicit modeling, polygon reduction, mesh smoothing, cutting, contouring, and Delaunay triangulation. VTK has an extensive information visualization framework, has a suite of 3D interaction widgets, supports parallel processing, and integrates with various databases on GUI toolkits such as Qt and Tk.

"xtail" watches the growth of files. It's like running a "tail -f" on a bunch of files at once. You can specify both filenames and directories on the command line. If you specify a directory, it watches all the files in that directory. It will notice when new files are created (and start watching them) or when old files are deleted (and stop watching them). This program is an oldie but goodie. It was posted to comp.sources.misc in July 1989 (see ftp.uu.net:/usenet/comp.sources.misc/volume7/xtail.Z). I remember posting an even earlier version to alt.sources. It has been published in the O'Reilly & Associates "Unix Power Tools" collection (book and CD-ROM). Over the years, some fly-by-night organizations (such as the MIT X Consortium and SGI) have tried to steal the "xtail" name. Don't be fooled! Insist on the original.

Gmerlin_avdecoder is a general purpose media decoding library. It was written as a support library for gmerlin, but it can also be used by other applications. You don't even need gmerlin installed, only gavl. Most of it was written completely from scratch, but the sourcetrees of some other great software packages were used as reference documentation. Credits go to the authors of Xine, MPlayer, quicktime4linux and ffmpeg. Gmerlin_avdecoder is one of the most complete general purpose media decoding libraries. The supported formats and codecs span a wide range of applications from consumer level (mp3, divx etc.) to high end production formats like 32 bit PCM and some professional uncompressed video codecs. Using gmerlin_avdecoder in your playback for transcoding application means rock solid media format support with an ever growing list of supported codecs and formats.

iso2mkv is software for automated DVD to XviD/vorbis MKV video conversion. Gives almost total control on the process of video compression at maximum quality, while being simple and straightforward to use (a kind of 'life-hack'). The intended audience is advanced end-users and the script is not user-error-proof. Based on mplayer, mencoder, oggenc or lame, and mkvmerge (if not properly installed, won't work). This is only a shell script that wraps the other programs. If you can watch the DVD with MPlayer, you can compress it with iso2mkv. Other used programs (hopefully included in most GNU/Linux distributions as well a FreeBSD :) ) are basename, bc, nice, stat.