Large-scale eigen solver package for Fortran?

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Fortran users seeking large-scale eigen solver packages should consider LAPACK, which is a well-known library for linear algebra that includes various methods for eigenvalue problems. The discussion emphasizes the need for specific techniques such as simultaneous, subspace, Ritz vectors, and Lanczos methods. Participants are encouraged to share their experiences or knowledge of additional packages that meet these requirements. The inquiry highlights the importance of finding robust solutions for complex eigenvalue computations in Fortran. Recommendations and insights from the community are welcomed.
Ronankeating
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Dear All,


I would like to know what type of solver packages can be used for solving the Large scale eigen problems, implemented in the Fortran language. Especially the simultaneous, subspace, ritz vectors, Lanczos etc.. methods is a must in the package. Does any of you aware of such packages ?

Your entry point will be appreciated?

Regards,
 
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