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CPAN, by Wikipedia https://en.wikipedia.org/wiki?curid=6667 / CC BY SA 3.0

#Perl
#Archive_networks
#Package_management_systems
CPAN logo The Comprehensive Perl Archive Network （CPAN） is a repository of over 250,000 software modules and accompanying documentation for 39,000 distributions, written in the Perl programming language by over 12,000 contributors.
CPAN can denote either the archive network or the Perl program that acts as an interface to the network and as an automated software installer （somewhat like a package manager）.
Most software on CPAN is free and open source software.
CPAN was conceived in 1993 and has been active online since October 1995.
It is based on the CTAN model and began as a place to unify the structure of scattered Perl archives.
Like many programming languages, Perl has mechanisms to use external libraries of code, making one file contain common routines used by several programs.
Perl calls these modules.
Perl modules are typically installed in one of several directories whose paths are placed in the Perl interpreter when it is first compiled; on Unix-like operating systems,
common paths include /usr/lib/perl5, /usr/local/lib/perl5, and several of their subdirectories.
Perl comes with a small set of core modules.
Some of these perform bootstrapping tasks, such as ExtUtils::MakeMaker, which is used to create Makefiles for building and installing other extension modules; others, like List::Util, are merely commonly used.
CPAN's main purpose is to help programmers locate modules and programs not included in the Perl standard distribution.
Its structure is decentralized.
Authors maintain and improve their own modules.
Forking, and creating competing modules for the same task or purpose, is common.
There is a third-party bug tracking system that is automatically set up for any uploaded distribution, but authors may opt to use a different bug tracking system such as GitHub.
Similarly, though GitHub is a popular location to store the source f...