"Volunteer labor" refers to work that is done by individuals out of their own free will and without receiving any payment or compensation in return. Full definition
Even though we are entirely self - funded through ticket sales, there's only so far we can go with volunteer labor and tickets. (hvsry.org)
If this is what the school you want to emulate is doing, will you school be able to recruit volunteer labor, or deploy teachers in the cafeteria at lunch? (thelunchtray.com)
The area was built with volunteer labor from The Duncan Family (Rick, Sandy & Nick), Tracy Grainer, Rose Stillo, Zack Collins and Victor Salas. (deltahumanesociety.com)