Toolkit for working with and mapping geospatial data
GeoTools is an open source (LGPL) Java codelibrary 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.
Java Marine API is an NMEA 0183 library for Java.
For furher info and latest source code, see project's Github pages.
http://github.com/ktuukkan/marine-api/
The Java RTree project aims to maintain an Java version of the RTree spatial indexing algorithm. See http://jsi.sourceforge.net for more information, and http://github.com/aled/jsi for latest development code.
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A fast, simple Java library for calculating Voronoi lines given an array of input coordinates. It does not feature code to display the results graphically.
OSIOSS (Open Source Integrated Observing System Software) is a collection of code which can be used for geospatial observing systems merging data collection, management and products solutions with ocean observing systems (OOS) as an initial focus.
JOSAST ( Java Open Source Amateur Satellite Toolkit) is a set of java source code used for amateur satellite, hamradio and also astronomia activities ...
Reusable package and complete software should be available.