is a popular adage communicating the idea that it is impossible to get something for nothing.
Image found at brighthubpm.com. Thank you Michele.
The English adjective free is commonly used in one of two meanings: "for zero price" (gratis) and "with little or no restriction" (libre).
Richard Stallman has described it as
Free software, freedom-respecting software, or software libre is computer software distributed
under terms that allow the software users to run the software for any purpose as well as to study, change,
and distribute the software and any adapted versions.
Free software is a matter of liberty, not price: users, individually or collectively, are free to do what they want with it, including the freedom to redistribute the software free of charge, or to sell it, or charge for related services such as support or warranty for profit.