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I am looking for a C or C++ or fortran library that implements the Jacobi eigenvalue algorithm:

http://en.wikipedia.org/wiki/Jacobi_eigenvalue_algorithm

do you know if it is available?

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The SelfAdjointEigenSolver of eigen (http://eigen.tuxfamily.org/index.php?title=Main_Page) uses the Jacobi algorithm.

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    thanks! better to use 3.0.4 or 3.1.0 alpha?2011-12-07
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This contains a shell archive of a bunch of FORTRAN routines implementing a version of the Jacobi method, due to Ivan Slapničar. See this paper for details on the algorithm.