TileMill is a tool for cartographers to quickly and easily design maps for the web using custom data. It is built on the powerful open-source map rendering library Mapnik - the same software OpenStreetMap and MapQuest use to make some of their maps. TileMill is not intended to be a general-purpose cartography tool, but rather focuses on streamlining and simplifying a narrow set of use cases.

Mapnik is a Free Toolkit for developing mapping applications. Above all Mapnik is about making beautiful maps. It is easily extensible and suitable for both desktop and web development

OpenStreetMap is a free editable map of the whole world. It is made by people like you. OpenStreetMap allows you to view, edit and use geographical data in a collaborative way from anywhere on Earth

MapQuest is an American free online web mapping service owned by AOL. MapQuest provides some extent of street-level detail and/or driving directions for a variety of countries. You can see if they include your country from a pull down menu on their home page. MapQuest also introduced "My Maps" personalization, which enables the user to personalize the interface.

Google Map Maker is a service launched by Google in June 2008, designed to expand the breadth of the service currently offered by Google Maps. In some countries mapping data is unavailable, and so to combat this problem Google has decided to open up Google Maps to a collaborative community effort in certain territories. The project is similar to OpenStreetMap (OSM), but unlike OSM which provides its map data under a Creative Commons license, Google obtains "... a perpetual, irrevocable, worldwide, royalty-free, and non-exclusive license to reproduce, adapt, modify, translate, publish, publicly perform, publicly display, distribute, and create derivative works of the User Submission".

The ultimate goal of the project is to acquire sufficient high-quality mapping data to be published and used on the existing Google Maps service. Some contributions have begun to appear on Google Maps, however the changes made in Map Maker are not immediately reflected on Google Maps.

Crowdmap is designed and built by the team behind Ushahidi, a platform that was originally built to crowdsource crisis information. As the platform has evolved, so have its uses. Crowdmap now allows users to set up their own deployments of Ushahidi without having to install it on a web server.

WikiMapia is a privately owned, online map and satellite imaging resource that combines Google Maps with a wiki system, allowing users to add information, in the form of a note, to any location on Earth. Users may currently use this information for free. Its aim is to "describe the whole world". All content uploaded by users is currently made available under Creative Commons license for non-commercial use through Wikimapia API.

OpenLayers is an open source (provided under a modified BSD license) JavaScript library for displaying map data in web browsers. It provides an API for building rich web-based geographic applications similar to Google Maps and Bing Maps. The library includes components from the Rico JavaScript library and the Prototype JavaScript Framework.

MapFish is a flexible and complete framework for building rich web-mapping applications. It emphasizes high productivity, and high-quality development. MapFish is based on the Pylons Python web framework. MapFish extends Pylons with geospatial-specific functionality. For example MapFish provides specific tools for creating web services that allows querying and editing geographic objects.

OpenSeaMap is a software project collecting freely usable nautical information and geospatial data to create a worldwide nautical chart. This chart is available on the OpenSeaMap website, and can also be downloaded for use as an electronic chart for offline applications. The project is part of OpenStreetMap. OpenSeaMap uses the same database, and complements the spatial data with nautical information. Such data may be used in accordance with Creative Commons Attribution-ShareAlike 2.0 license. This ensures integration into printed materials, websites and applications is possible, without being limited by restrictive licenses, or having to pay fees. The naming of OpenSeaMap as a data source is required for data sharing.