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p5-Geo-KML is a perl module to process GML(Geography Markup Language) file.

p5-Geo-Gpx is a perl module to Create and parse GPX files.

Geo::Point tries to abstract coordinate systems. It does not try to solve all the problems itself, but will call-out for helper modules when computation has to be done. The module is heavily resting on Math::Polygon.

The Open Source PROJ.4 library converts between geographic coordinate systems. It is able to convert between geodetic latitude and longitude (LL, most commonly the WGS84 projection), into an enormous variety of other cartographic projections (XY, usually UTM).

Geometry::Primitive is a device and library agnostic system for representing geometric entities such as points, lines and shapes. It provides simple objects and many convenience methods you would expect from a geometry library.

Gimp - Perl extension for writing Gimp Extension/Plug-ins/Load & Save-Handlers.

p5-Google-Chart is a Perl interface to Google Charts API.

Graph::Easy lets you generate graphs consisting of various shaped nodes connected by edges (with optional labels).

This is a collection of perl classes for reading and writing directed graphs in a variety of file formats. The graphs are represented in Perl using Jarkko Hietaniemi's Graph classes.

This module implement a interesting graph application that is called the 'Social Relation Map'. It provides object-oriented way to retrieve many social information that can be found in this map. The new() constructor accepts one argument in the for of 'hashref of arrayref'. The key to this hash is the name of relation, and the value of the hash is a list of identities involved in this relation.