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.
UPDATE March 14, 2018
Repository and tracking officially moved to github. https://github.com/opticks-org/opticks
Sourceforge mailing lists are still in use.
Opticks is an open source remote sensing application and development framework.
A set of extensions to Tcl/Tk for reading, manipulating, and displaying geographic and cartographic data. It can serve as a starting point for development of new GIS and cartography applications.