FloPoCo is a generator of Floating-Point (but not only) Cores for FPGAs.

FloPoCo is distributed under the GNU General Public License (see
COPYING for details), and the operators it generates can be used under
the terms of the GNU Lesser General Public License (see COPYING.LIB
for details). You are free to use and distribute them without changing
this license. You are also free to modify them, as long as you make
the modifications available. In the latter case please consider
modifying FloPoCo instead, or get in touch with the FloPoCo team for
this purpose.
