Adjective: pro bono

To work for the good of the public rather than for a profit or income.

Notes:
For example, working “Pro Bono” means you work without charging a fee.

Pro bono publico (often shortened to pro bono) is a phrase derived from Latin meaning “for the public good”. It is used to designate legal or other professional work undertaken voluntarily and without payment, as a public service. In some cases pro bono counsel may assist an individual or group on a legal case, in filing government applications or petitions or on appeal. If the case is won, occasionally the Judge may determine that the loser should compensate the pro bono counsel.

In the UK, “pro bono publico” is sometimes used to describe the central motivation of large organisations such as the BBC, the National Health Service and various NGOs, which exist “for the public good” rather than for shareholder profit.