DASSFLOW

Yes, it is freely distributed under CeCILL licence.
If you use or adapt this code, please cite ! eg as follows:

@misc{dassflow-1d,
title = {DassFlow (Data Assimilation for Free Surface Flows) computational software},
author = {K. Larnier, J. Monnier et al.},
note = {INSA, Math. Institute of Toulouse (IMT), INRAe, ICUBE, CS Group, CNES},
url = {https://www.math.univ-toulouse.fr/DassFlow},
year={2022},
}

@misc{dassflow-2d,
title={DassFlow (Data Assimilation for Free Surface Flows) computational software},
author={L. Pujol, J. Monnier, P.-A. Garambois, F. Couderc et al.},
note = {INSA, Math. Institute of Toulouse (IMT), INRAe, ICUBE, CNRS},
url = {https://www.math.univ-toulouse.fr/DassFlow},
year={2022},
}

Also by citing the adequate articles (see 'References' page).
No commercial use allowed without permission.

Please see above; also consult the webpage "References".

Please consult the webpage "Download".

It is distributed with a Makefile that should work on most Linux systems.
You will need to have the right Fortran compiler and a C compiler installed on your machine. For more details, consult the doc available in the archive distributed and on-line (see below).

• Mesh creators
  • Gmsh, Elmer library mesh generator, Telemac mesh generator, Emc2 (Inria).
• Visualizers
  • vtk format eg Paraview. Also Tecplot format.

Documentations (users / programmers / numerics manuals) are available in the distributed archive (along the source files), consult the "Download" page.
As example an old version is available online (HAL CNRS): pdf file .

Have a look to the few examples of applications on the present website.