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The vecmath jar was originally shipped as part of the java extensions for Java 3D. It is a pretty good library - that we use for matrix calculations in the gt-referencing module.

We are using the older version here on the 1.3.2 tag:

Unfortunately not technically open source. As shown by the above three links it has a Java Research License (JRL) for academics wanting to experiment or Java Distribution License (JDL) for commercial binary distribution.

Official Fork is GPL

There is an official fork here https://java.net/projects/vecmath. Unfortunately it is has migrated (like the JRE) to using a GPL license making it unsuitable for use in GeoTools.

 See the use of LICENSE.txt on svn trunk:

With upgrading no longer an option there is a wide range of options:

There is some stack exchange discussion on performance of java matrix libraries which was inconclusive.

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