Free, Open dynamic web mapper. (An alternative to Google/Yahoo Maps)
OpenStreetMap is a project aimed squarely at creating and providing free geographic data such as street maps to anyone who wants them.
Free/Open Source ActiveX GIS Mapping and analysis tool
Mapufacture provides dynamic, customizable geographic information and collaborative mapping.
A project of Aspiration
Supported by the Open Society Institute Information Program
History and Appreciations
Engineering by Brattleboro Tech Collective
Design by Quilted