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　FreeMindは、議論やアイデアをまとめる手法であるマインドマップを作成するためのフリーのソフトウェアです。簡単にグラフィカルなマインドマップを作成できるほか、作成したマインドマップをPDFやPNG、HTMLといった形式で保存する機能も備えています。

　FreeMindで作成したマインドマップは自由に展開/折り畳みができ、またWebブラウザで動的に動くマップを作成することもできます。

マインドマップとは？

　マインドマップは、ある対象について、関連するキーワードや想起されるイメージを放射状に繋げながら描いていくことで分析/表現を行うものです。キーワードやイメージを繋げていく表現方法は人間の脳が物事を記憶/分析する方法に近いと言われており、物事の特徴を把握しやすく図示する方法であると言われています。

　マインドマップの基本的な作成ルールは非常に単純です。まず、分析/表現したい対象を中心に書き、そこから放射状に線を延ばしてその事柄に関連するキーワードや想起されるキーワードを書き込みます。続いて新たに書き込まれたキーワードに対し、同様に関連/するキーワード、想起されるキーワードを書き込んでいく、というステップを繰り返すことで、マインドマップは作成されます。

　FreeMindはWindowsおよびMac OS X、Linuxで動作します。また、実行にはjava.comからダウンロードできるJava Runtime Environment（JRE）が必要です。最新版のJREをダウンロードしてからインストールを行ってください。

QCAD is an application for computer aided drafting (CAD) in two dimensions (2D). With QCAD, you can create technical drawings such as plans for buildings, interiors, mechanical parts, or schematics and diagrams. QCAD can be easily extended through plugins and its very powerful and complete ECMAScript (JavaScript) interface.

GNU TeXmacs is a free wysiwyw (what you see is what you want) editing platform with special features for scientists. The software aims to provide a unified and user friendly framework for editing structured documents with different types of content: text, mathematics, graphics, interactive content. TeXmacs can also be used as an interface to many external systems for computer algebra, numerical analysis, and statistics. New presentation styles can be written by the user and new features can be added to the editor using Scheme.

PasTmon (Passive Application Response Time Monitor) passively monitors your application servers, measuring and reporting user response times, throughput and congestion. It currently works with HTTP, telnet, rlogin, rsh, FTP (control channel), SMTP, POP3, and IRC. Measurements are recorded in a PostgreSQL database and are presented graphically via a PHP Web front-end using R statistical analysis scripts to create the plots.

white_dune is a graphical VRML97/X3DV editor, simple NURBS/Superformula 3D modeller, animation tool, and VRML97/X3DV commandline compiler in development. VRML97 (Virtual Reality Modeling Language) is the ISO standard for displaying 3D data over the Web via browser plugins ("HTML for realtime 3D"). X3DV is the direct successor of VRML97. VRML97 and X3DV have support for animation, real-time interaction, and multimedia (images, movies, and sounds). white_dune can read, create, and display VRML97/X3DV files and let the user change the scenegraph/fields. It also has support for stereoscopic view via "quadbuffer"-capable stereo visuals, and support for 3D input devices like a joystick, spaceball, or magnetic tracker.

R is a language and environment for statistical computing and graphics. It is similar to S, which was developed at Bell Laboratories by John Chambers et al. It provides a wide variety of statistical and graphical techniques (linear and nonlinear modelling, statistical tests, time series analysis, classification, clustering, etc.). R is designed as a true computer language with control-flow constructions for iteration and alternation, and it allows users to add additional functionality by defining new functions. For computationally intensive tasks, Fortran and C code can be linked and called at run time.

mxGraph is a JavaScript library that uses built-in browser capabilities to provide an interactive drawing and diagramming solution. Target applications are Web based applications that require workflow/BPM, diagram, network, or general graph editing to be available in-place on a Web page.

JSXGraph is a cross-browser library for interactive geometry, function plotting, and data visualization in a Web browser. It is implemented in JavaScript and uses SVG, VML, or canvas. JSXGraph is easy to embed and has a small footprint: about 120kB if embedded in a Web page. No plugins or further libraries are required.

MathGL is a library for making high-quality scientific graphics under Linux and Windows, fast data plotting and handling of large data arrays, working in window and console modes, and easily embedding into other programs. It has more than 40 general types of graphics for 1d, 2d, and 3d data arrays. It can export graphics to raster and vector (EPS or SVG) formats. It has an OpenGL interface and can be used from console programs. It has functions for data handling and MGL language scripting for simplification of data plotting. It has several types of transparency and smoothed lightning, vector fonts and TeX-like formula drawing, an arbitrary curvilinear coordinate system, and many other useful things.

JGraph is a free, mature, and robust Java diagramming library. It contains all the graph visualization, layout, and interaction functionality you might expect in a graph library, including multiple views, layering, zoom, drag and drop, undo, automatic expanding and collapsing, routing, and layouts. You can create workflow editors, BPMN, CAD tools, network diagrams, database visualization tools, and more. It is fully documented, including examples, and has an active support community.

Timeline is a cross-platform application for displaying and navigating events on a timeline.

GeoTools is a GIS toolkit that is used for OGC-based projects via GeoAPI interfaces. It includes two great SLD based renderers and tools for raster access and reprojection as well as plugins for Shapefile, ArcGrid, ArcSDE, Postgis, OracleSpatial, MySQL, and many more.