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RealTimeBattle is a programming game for Unix-like systems, in which robots controlled by programs coded in any language are fighting with each other. The general intend is to destroy the enemies, by using the radar to locate them and firing them to oblivion with the cannon. Great tool for learning how to code in C/C++ or other languages.

GEOS (Geometry Engine - Open Source) is a C++ port of the Java Topology Suite (JTS). As such, it aims to contain the complete functionality of JTS in C++. This includes all the OpenGIS "Simple Features for SQL" spatial predicate functions and spatial operators, as well as specific JTS topology functions such as IsValid().

MakeHuman(C) is an open-source, open graphics library, stand-alone, multi-platform, software program, which is completely written in C language. Its purpose is to provide a versatile, professional and extremely specialized application for parametrical modeling of three-dimensional humanoid characters.

The GNU plotutils package contains plotting software for both programmers and technical users. Its centerpiece is libplot, a powerful C/C++ function library for exporting 2-D vector graphics in many file formats, both vector and raster. It can also do vector graphics animations.

This is the standalone math library from R -- a language and environment for statistical computing and graphics. See ports/math/R. To use the routines in your own C or C++ programs, include #define MATHLIB_STANDALONE #include <Rmath.h> and link against -lRmath.

This is the PHP extension of the pHash library, which is an open source software library released under the GPLv3 license that implements several perceptual hashing algorithms, and provides a C-like API to use those functions in your own programs. pHash itself is written in C++.

AVFS is a system, which enables all programs to look inside gzip, tar, zip, etc. files or view remote (ftp, http, dav, etc.) files, without recompiling the programs. Shared library and FUSE daemon are provided. AVFS is (C) under the GNU GPL. The shared library supporting AVFS with LD_PRELOAD is (C) under the GNU LGPL.

Sys::Hostname::FQDN uses the host 'C' library to discover the (usually) short host name, then uses (perl) gethostbyname to extract the real hostname. The results from gethostbyname are exported as gethostinfo and asciihostinfo as a convenience since they are available. Similarly, the 'C' library functions inet_ntoa and inet_aton are exported.

By default, this module exports a single hash (`%RE') that stores or generates commonly needed regular expressions. Patterns currently provided include: * balanced parentheses and brackets * delimited text (with escapes) * integers and floating-point numbers in any base (up to 36) * comments in C, C++, Perl, and shell * offensive language * lists of any pattern * IPv4 addresses

Text::Highlight is a flexible and extensible tool for highlighting the syntax in programming code. The markup used and languages supported are completely customizable. It can output highlighted code for embedding in HTML, terminal escapes for an ANSI-capable display, or even posting on an online forum. Bundled support includes C/C++, CSS, HTML, Java, Perl, PHP and SQL.