Simplify the following text for a Grade 8 native English-speaking person.
Original: The GNU Lesser General Public License ( formerly the GNU Library General Public License ) or LGPL is a free software license published by the Free Software Foundation ( FSF ) .
Simplified: The GNU Lesser General Public License ( LGPL ) is a free software license created by the Free Software Foundation . It is similar to the GNU General Public License and is also an open source license .