Toolkit for working with and mapping geospatial data
GeoTools is an open source (LGPL) Java code library which provides standards compliant methods for the manipulation of geospatial data.
GeoTools is an Open Source Geospatial Foundation project.
The GeoTools library data structures are based on Open Geospatial Consortium (OGC) specifications.
Mapyrus is software to plot Geographic Information System data to PostScript, PDF, SVG and web image files. Mapyrus combines a BASIC-like scripting language, reading GIS datasets and running as either a utility program, a Java Servlet, or as a webser
GeOxygene aims at providing an open framework which implements OGC/ISO specifications for the development and deployment of geographic (GIS) applications. It is a open source contribution of the COGIT lab. at the IGN (the French National Mapping Agency).
WW2D allows you to explore Earth using satellite imagery, topographic maps and image from other data sources also providing large placenames and boundaries database and allowing you to install community-made add-ons for even more info about our planet.
CAVOR is an engine for building apps that involve both graphic and text/numeric data. Primarily GIS is the initial focus, but consider also CAD, CASE, project management (eg PERT charts), and others. Built-in scripting, C API, also supports Tcl and Java.