GeoTools is a free Java-based mapping toolkit that allows maps to be viewed interactively on web browsers without the need for dedicated server-side support.
The Geographic Resources Analysis Support System (GRASS) is a free software (GPL') Geographical Information System (GIS) with raster, topological vector, image processing, and graphics production functionality.
A weekly drop-in workshop held on
2:30PM Mondays at VCN. You should be familiar with basic Internet skills
to benefit from these sessions. Bring your particular web page, and
mailing list problems.