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<h3>Developers</h3>
<p>Many developers have contributed to PLplot over its long history. The list of the current core developers is <a href="http://sourceforge.net/p/plplot/_members/">here.</a> Activity graphics for the last 5 years for a historically complete list of developers is at <a href="http://www.openhub.net/p/plplot/contributors/summary">the PLplot contributor summary page at Open HUB</a>. In addition many other individuals have contributed to PLplot by providing patches, finding bugs, or requesting features.</p>
<h3>Additional libraries</h3>
<p>The PLplot library depends on some other open source libraries provided by
the community.</p>
<h4>PLplot core dependencies</h4>
<ul class="arrowlist">
<li><a href="http://www.qhull.org/">Qhull</a>: computes the convex hull, Delaunay
triangulation, Voronoi diagram, halfspace intersection about a point,
furthest-site Delaunay triangulation, and furthest-site Voronoi diagram.</li>
<li><a href="http://shapelib.maptools.org/">shapelib</a>: allows the subset of our API concerned with maps to read maps in shapefile format.</li>
</ul>
<h4>PLplot device-driver dependencies</h4>
<p> N.B. each device driver is an optional component of PLplot.</p>
<ul class="arrowlist">
<li>The aquaterm device driver depends on <a href="http://aquaterm.sourceforge.net/">AquaTerm.app</a>; a Mac OS X plotting front end (graphics terminal) written using Objective-C and the Cocoa API.</li>
<li>The cairo device driver depends on <a href="http://www.pango.org/">Pango</a>; a library for laying out and rendering of text, with an emphasis on internationalization.</li>
<li>The cairo device driver depends on <a href="http://www.cairographics.org/">cairo</a>; a 2D graphics library with support for multiple output devices. Currently supported output targets include the X Window System, Quartz, Win32, image buffers, PostScript, PDF, and SVG file output.</li>
<li>The gd and wingcc device drivers depend on <a href="http://www.freetype.org/">FreeType</a>; a free, high-quality, and portable font engine.</li>
<li>The gd device driver depends on <a href=" https://libgd.github.io/">libgd</a>; an open-source code library for the dynamic creation of images by programmers.</li>
<li>The pdf device driver depends on <a href="http://www.libharu.org/">libHaru</a>; a free, cross-platform, open-source library for generating PDF files.</li>
<li>The psttf device driver depends on <a href="http://www.unifont.org/lasi/">LASi</a>; a library that provides a C++ stream output interface (with operator <<) for creating Postscript documents that can contain characters from any of the scripts and symbol blocks supported in Unicode and by Owen Taylor's Pango layout engine.</li>
<li>The Qt device driver depends on <a href="https://www.qt.io/download-open-source/">Qt</a>; a multi-platform toolkit library for creating graphical user interfaces.</li>
<li>The wxwidgets device driver depends on <a href="http://www.wxwidgets.org/">wxWidgets</a>; a GUI and tools library that lets developers create GUI applications for Win32, Mac OS X, GTK+, X11, Motif, WinCE, and more using one codebase.</li>
</ul>
<h3>Tools</h3>
<p>The development of the Plplot project is supported by the use of several open source tools.</p>
<ul class="arrowlist">
<li><a href="http://www.cmake.org/">CMake</a>, a cross-platform, open-source build system.</li>
<li><a href="http://www.swig.org/">SWIG</a>, a software development tool that connects programs written in C and C++ with a variety of high-level programming languages.</li>
<li><a href="http://www.freedesktop.org/wiki/Software/pkg-config/">pkg-config</a>, a helper tool used when compiling applications and libraries.</li>
<li><a href="http://www.docbook.org/">DocBook</a>, an XML schema which is particularly well suited for writing documentation of computer hardware and software.</li>
</ul>
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