The TIFA library is copyrighted © 2011, 2014 CNRS, Ecole Polytechnique and INRIA, and redistributed under the terms of the GNU Lesser General Public License; either version 2.1 of the License, or (at your option) any later version.
Make sure you have read and understood the terms of the licence before downloading and using the TIFA library.
The usual caveats about development software apply.
The source can now be downloaded from the project's GitHub page.