Python-SoXR (LGPLv2.1+)
https://github.com/dofuuz/python-soxr

    Python-SoXR, Resampler library for Python.
    Copyright (c) 2021-23 Myungchul Keum

    This library is free software; you can redistribute it and/or modify it
    under the terms of the GNU Lesser General Public License as published by
    the Free Software Foundation; either version 2.1 of the License, or (at
    your option) any later version.

    This library is distributed in the hope that it will be useful, but
    WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser
    General Public License for more details.

    You should have received a copy of the GNU Lesser General Public License
    along with this library; if not, see <https://www.gnu.org/licenses/>.


----

libsoxr (LGPLv2.1+)
https://sourceforge.net/projects/soxr/

    SoX Resampler Library       Copyright (c) 2007-18 robs@users.sourceforge.net

    This library is free software; you can redistribute it and/or modify it
    under the terms of the GNU Lesser General Public License as published by
    the Free Software Foundation; either version 2.1 of the License, or (at
    your option) any later version.

    This library is distributed in the hope that it will be useful, but
    WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser
    General Public License for more details.

    You should have received a copy of the GNU Lesser General Public License
    along with this library; if not, see <https://www.gnu.org/licenses/>.


----

PFFFT (BSD-like)
https://bitbucket.org/jpommier/pffft/

    Copyright (c) 2013  Julien Pommier ( pommier@modartt.com ) 

    Based on original fortran 77 code from FFTPACKv4 from NETLIB,
    authored by Dr Paul Swarztrauber of NCAR, in 1985.

    As confirmed by the NCAR fftpack software curators, the following
    FFTPACKv5 license applies to FFTPACKv4 sources. My changes are
    released under the same terms.

    FFTPACK license:

    http://www.cisl.ucar.edu/css/software/fftpack5/ftpk.html

    Copyright (c) 2004 the University Corporation for Atmospheric
    Research ("UCAR"). All rights reserved. Developed by NCAR's
    Computational and Information Systems Laboratory, UCAR,
    www.cisl.ucar.edu.

    Redistribution and use of the Software in source and binary forms,
    with or without modification, is permitted provided that the
    following conditions are met:

    - Neither the names of NCAR's Computational and Information Systems
    Laboratory, the University Corporation for Atmospheric Research,
    nor the names of its sponsors or contributors may be used to
    endorse or promote products derived from this Software without
    specific prior written permission.  

    - Redistributions of source code must retain the above copyright
    notices, this list of conditions, and the disclaimer below.

    - Redistributions in binary form must reproduce the above copyright
    notice, this list of conditions, and the disclaimer below in the
    documentation and/or other materials provided with the
    distribution.

    THIS SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
    EXPRESS OR IMPLIED, INCLUDING, BUT NOT LIMITED TO THE WARRANTIES OF
    MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
    NONINFRINGEMENT. IN NO EVENT SHALL THE CONTRIBUTORS OR COPYRIGHT
    HOLDERS BE LIABLE FOR ANY CLAIM, INDIRECT, INCIDENTAL, SPECIAL,
    EXEMPLARY, OR CONSEQUENTIAL DAMAGES OR OTHER LIABILITY, WHETHER IN AN
    ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
    CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS WITH THE
    SOFTWARE.