In addition to using the maps we create, you can design your own maps with TileMill. Make custom maps or design data overlays with our free map design application.

At present, a tremendous enabler of empirical software engineering research is the open-source software movement, which is rapidly generating a freely available accumulation of code along with complete archives of the communications between developers. In an open-source setting, programmers collect around software projects to produce applications that they want to see available for free. The developers are often in different places and time zones, so communication occurs via email and online forums. The code and communication records are accessible to all via websites, so interested developers can join the project at any stage to share expertise, troubleshoot and add to the source code.

These electronic repositories are a software-engineering researcher’s paradise. They constitute a historical record of the life of a project, including all of the dead ends and debates, the task assignments, the development of team structure and many other artifacts. With thoughtful and targeted searches, researchers can explore topics such as how newcomers adapt to a software project’s culture. They can test prediction engines to assess the validity of theories about project structure and code development. Bug-tracking records and the interpersonal interactions involved in solving software flaws serve as a narrative of the incremental improvement of code quality.

Common Crawl Foundation is a California 501(c)3 non-profit founded by Gil Elbaz with the goal of democratizing access to web information by producing and maintaining an open repository of web crawl data that is universally accessible.

Piwik is a downloadable, open source (GPL licensed) real time web analytics software program. It provides you with detailed reports on your website visitors: the search engines and keywords they used, the language they speak, your popular pages… and so much more.

Piwik aims to be an open source alternative to Google Analytics.

Elgg is an award-winning social networking engine, delivering the building blocks that enable businesses, schools, universities and associations to create their own fully-featured social networks and applications.

Mahout's goal is to build scalable machine learning libraries.

This post is both a tutorial and a "getting started" overview. You will learn about Cassandra's features, data model, API, and operational requirements—everything you need to know to deploy a Cassandra-backed service.

Geocoder::US 2.0 is a software package designed to geocode US street

Concurrence is a framework for creating massively concurrent network applications in Python.

Anzo is an open source enterprise-featured RDF store and service oriented middleware platform that provides support for multiple users, distributed clients, offline work, real-time notification, named-graph modularization, versioning, access controls, and transactions with preconditions.

Cappuccino is an open source framework that makes it easy to build desktop-caliber applications that run in a web browser.

SeerSuite is an application toolkit for digital libraries and search engines; i.e., CiteSeerX.

CHDK is a firmware enhancement that operates on a number of Canon Cameras. CHDK gets loaded into your camera's memory upon bootup (either manually or automatically). It provides additional functionality beyond that currently provided by the native camera firmware.

OpenViewer is a BSD-licensed open source 3D world viewer. The goal here is to make something that can be embedded in a website, but share code across multiple different platforms - eg the same code that runs the website control also runs the desktop standalone application.

Project Wonderland is a 100% Java and open source toolkit for creating collaborative 3D virtual worlds. Within those worlds, users can communicate with high-fidelity, immersive audio, share live desktop applications and documents and conduct real business.

OpenSimulator is a 3D Application Server. It can be used to create a 3D Virtual World (ala Second Life(tm)), and includes facilities for creating custom avatars, chatting with others in the environment, building 3D content in world, and creating complex 3D applications in world. OpenSimulator can also be extended via loadable modules or web service interfaces to build more custom 3D Applications.

A free, open source frontend to the Liquid Rescale Library, which provides an implementation of the Seam Carving algorithm, which resizes pictures non uniformly while preserving their features, i.e. avoiding distortion of the important parts.

Pure ActionScript 3 implementation of the Ogg and Vorbis libraries that require no kind of native support from the Flash Player.

FreeCite is an open-source application that parses document citations into fielded data. You can use it as a web application or a service.

It is architected as a supervised machine learning procedure that uses Conditional Random Fields as its learning mechanism.

The open-source multi-modal trip planner.

The software annotates text with 41 broad semantic categories (Wordnet supersenses) for both nouns and verbs; i.e., it performs both sense disambiguation and named-entity recognition. The tagger implements a discriminatively-trained Hidden Markov Model.

Mapnik is a Free Toolkit for developing mapping applications.

rdfxml.py is a standalone Python module in under 10KB that parses RDF/XML using SAX.

Launchpad is a free software hosting and development website. We make it easy to collaborate across multiple projects.

Pellet is an open source, OWL DL reasoner in Java.

Persevere is an open source set of tools for persistence and distributed computing using an intuitive standards-based JSON interfaces of HTTP REST, JSON-RPC, JSONPath, and HTTP Channels.

A standalone search engine, meant to provide fast, size-efficient and relevant fulltext search functions to other applications. Sphinx was specially designed to integrate well with SQL databases and scripting languages.

Libraries for constructing, parsing, manipulating and serializing OAI-ORE Resource Maps.

We wanted our maps to be a clean, low-energy slate for plotting news items in their geospatial context, their spatial relationship with each other. That’s the emphasis, rather than wayfinding.

Owlgres is an open source, scalable reasoner for OWL2.

It joins the SWI-Prolog RDF and HTTP infrastructure with a SeRQL/SPARQL query engine, interfacing to the The Yahoo! User Interface Library (YUI) and libraries that support semantic search.

Prolog packages for reading, querying and storing semantic web documents as well as XPCE libraries that provide visualisation and editing.

OpenLayers is a pure JavaScript library for displaying map data in most modern web browsers, with no server-side dependencies.

Carl Malamud: Suggesting that students interested in furthering the public domain... start harvesting documents from the public taxpayer-financed web sites at UMich and re-injecting them into the public domain?

A software framework for scalable cross-language services development. It combines a powerful software stack with a code generation engine to build services that work efficiently and seamlessly between C++, Java, Python, PHP, and Ruby.

The goal of the Apache Abdera project is to build a functionally-complete, high-performance implementation of the IETF Atom Syndication Format (RFC 4287) and Atom Publishing Protocol (RFC# Pending) specifications.

BUG is a collection of easy-to-use electronic modules that snap together to build any gadget you can imagine.

Flower is a new kind of user programmable web service, especially well suited for applications which process, store, and query XML data sets.

PyLucene is a Python extension for accessing Java Lucene. Its goal is to allow you to use Lucene's text indexing and searching capabilities from Python.

Zebra is a high-performance, general-purpose structured text indexing and retrieval engine.

Djapian provides integration between Xapian and Django.

Xapian is an Open Source Search Engine Library, released under the GPL. It's written in C++, with bindings to allow use from Perl, Python, PHP, Java, Tcl, C# and Ruby.

CLucene is a high-performance, scalable, cross platform, full-featured, open-source indexing and searching API. It is written in C++.

A ruby/python based HTML parser/tokenizer based on the WHATWG HTML5 specification for maximum compatibility with major desktop web browsers.

A Python template language that is smart about markup: it knows the difference between tags, attributes, and actual text nodes.

Mapstraction is a library that provides a common API for various javascript mapping APIs to enable switching from one to another as smoothly as possible.

One of the core features of Modest Maps is support for custom geographical tile sets.

Probably one of the most accurate open source OCR engines available. The source code will read a binary, grey or color image and output text.

Services include the ability to search and browse a large variety of texts and can be used with Perseus' Art and Archaeology Module.

Python client API for accessing Freebase.com.

The DBpedia community uses a flexible and extensible framework to extract different kinds of structured information from Wikipedia.

CodeIgniter is a powerful PHP framework with a very small footprint, built for PHP coders who need a simple and elegant toolkit to create full-featured web applications.

MooTools is a compact, modular, Object-Oriented JavaScript framework designed for the intermediate to advanced JavaScript developer.

A major component of the proposed work concerns developing the foundations of bi-directional programming languages, in which every program denotes a pair of functions---one for extracting a view of some complex data structure, and another for ``putting ba

Libferris includes initial support for mounting Web photo services as a filesystem. This means that sites such as flickr.com can be seen as filesystems, which allows users to upload digital pictures easily by using the cp tool with a destination of flickr

libferris, at its, core is a virtual filesystem allowing many different data sources to be exposed through a filesystem interface. These include the expected things like file://, http://, ftp:// as well as databases, XML files, and even applications like

You can supply queries against the contents or metadata of any libferris accessable object and have the results returned as a virtual filesystem. With the above mentioned metadata available for searching, finding your files can be done in many different w

Data is organized into tables, rows and columns, but a query language like SQL is not supported. An Iterator-like interface is available for scanning through a row range (and of course there is an ability to retrieve a column value for a specific key).

The highest abstraction layer in Pig is a query language interface, whereby users express data analysis tasks as queries, in the style of SQL or Relational Algebra.

CKAN is the Comprehensive Knowledge Archive Network, a registry of open knowledge packages and projects (and a few closed ones). CKAN is the place to search for open knowledge resources as well as register your own.

The vdm package allows you to 'version' your domain model objects in the same way that source code version control systems such as subversion help you version your code.

Audio, Image Processing & VR packages from Andre Michelle.

DSpace is an open source digital repository software system for research institutions.

The Sample Pool API allows two media hosting servers to keep track of when one uses samples from another.

SVG fonts and animation are not on the development schedule for Firefox 3. Here are some thoughts about what would be needed to implement these features.

OpenQA is the premier source for quality open source QA projects.

Free software graphics developers and artists meeting each other, exchanging ideas and tips, and planning the future of free graphics.

Download to make your own stickers, posters, stencils, signs, handbills or T-shirts. All designs in this section are copyright free or "copyleft" and part of the Public Domain, unless otherwise noted.

Solr is an open source enterprise search server based on the Lucene Java search library, with XML/HTTP and JSON APIs, hit highlighting, faceted search, caching, replication, and a web admin interface.

Potrace is a utility for tracing a bitmap, which means, transforming a bitmap into a smooth, scalable image.

This project aims to create an archive of user contributed clip art that can be freely used. All graphics submitted to the project should be placed into the Public Domain

The purpose of this wiki page is to keep track of the Open Clip Art Library's progress of acquiring, converting and archiving the huge source of Public Domain artwork that is available on the internet.

The CDL eXtensible Text Framework (XTF) is a flexible indexing and query tool that supports searching across collections of heterogeneous data and presents results in a highly configurable manner.

Freja is an Open-Source MVC Javascript Framework which uses XSLT to transform XML docs to presentation formats.

As my host Michael Buckland observed, there is clarity in the counsel of our fundamentals: making information available, ensuring open access, assisting others in discovery, creating user-empowering tools and services.

NewsCloud is an open source media platform for citizen journalism and the social news network.

Open source e-book reader that creates a community of readers with embedded forums, discussion groups, polls, and shared annotations.

Seagull is an object oriented framework written in PHP that focuses on best practices, clean code and reusable components.

The Encyclopedia is a free, fully searchable collection of articles written by scholars, professionals, educators, and experts who collaborate and review each other's work.