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GeoServer is a GIS server. It is open source and it allows users to view and edit geographic data. GeoServer is a fully functional WFS-T and WMS server that follows the OGC specifications. GeoServer is a tool you can display maps on web pages, where the user can zoom and pan around. And it is used in conjunction with clients such as OpenLayers, Google Earth, UDig, GVSig and others.

Gimmage is a simple image viewer that aims to have a minimalist interface and tries to be keyboard operable for browsing through a large number of images quickly. It is appropriate for command line usage as it accepts directories and image filenames as arguments. It has an in-application file browser that allows users to select and drag images and directories into the image viewing area in order to have them displayed.

ggplot2 is a plotting system for R, based on the grammar of graphics, which tries to take the good parts of base and lattice graphics and none of the bad parts. It takes care of many of the fiddly details that make plotting a hassle (like drawing legends) as well as providing a powerful model of graphics that makes it easy to produce complex multi-layered graphics.

AA-lib is a low-level graphics library similar to many other libraries except for the fact that AA-lib does not require a graphics device! In fact, no "graphical" output is possible. AA-lib uses a modern, high-tech ascii-art renderer in place of outmoded and cumbersome graphical output. The AA-lib API is designed to be similar to that of other graphics libraries so learning its API should be simple.

Mahotas is a computer vision and image processing library for Python. It includes many algorithms implemented in C++ for speed while operating in numpy arrays and with a very clean Python interface. Notable algorithms: - Watershed - Convex points calculations - Hit & miss thinning - Zernike & Haralick, LBP, and TAS features - Freeimage-based numpy image loading - Speeded-Up Robust Features (SURF), a form of local features - Thresholding - Convolution - Sobel edge detection

Non-Uniform Rational B-Splines (NURBS) are parametric functions which can represent any type of curves or surfaces. This C++ library hides the basic mathematics of NURBS, allowing the user to focus on the more challenging parts of their projects. The NURBS++ package includes a matrix library, an image manipulation library, a numerical library and a NURBS library. This library is copyrighted under the terms of the LGPL by its author, Phillipe Lavoie <lavoie@zeus.genie.uottawa.ca>.

This is a Perl implementation of the reCAPTCHA API. From the recaptcha.net web site: reCAPTCHA improves the process of digitizing books by sending words that cannot be read by computers to the Web in the form of CAPTCHAs for humans to decipher. More specifically, each word that cannot be read correctly by OCR is placed on an image and used as a CAPTCHA. This is possible because most OCR programs alert you when a word cannot be read correctly.

This module provides conversions between commonly used ways to express colors. It provides conversions between color spaces such as RGB and HSV, and it provides ways to look up colors by a name. This class provides a base for subclasses which represent particular color values in particular spaces. The base class provides methods to represent the color in a few convenient forms, though subclasses may provide more specific details for the space in question.

Perl helper class for implementing the Google Chart Tools Datasource Protocol. The Google Visualization API is a nifty bit of kit for generating pretty pictures from your data. By design it has a fair amount of Google-cruft, such as non-standard JSON and stuffing configuration options in to a single CGI query parameter. Data::Google::Visualization::DataTable takes care of preparing data for the API.

'pgperl' is a version of the Perl language which has available the PGPLOT FORTRAN library, a very popular package for plotting astronomical data. (As a glance through any issue of ApJ or MNRAS will confirm.) The details of this involve some complicated C glue routines but are transparent to the user. See the file LICENSE in /usr/local/share/doc/pgperl for copyright/licensing information and the file pgperl.doc on how to use pgplot from perl.