https://www.polygon.com/2018/10/23/18013656/fallout-new-california-mod-project-brazil

Following seven years of development by a team of dedicated volunteers, Fallout: New California launches today. The mod uses 2010’s Fallout: New Vegas as its base, a title widely regarded as having some of the best writing of all the modern Fallout games. Also known as Project Brazil, the mod’s release is conspicuously timed to coincide with the first closed beta for Fallout 76, the first online-multiplayer entry in the franchise’s history.

According to its developers, New California is intended to bridge the gap between Fallout 2, Fallout 3 and Fallout: New Vegas. It tells the story of what happened after the war between the New California Republic and the Enclave, all from the perspective of a vault dweller raised by a rugged faction of scouts in the San Bernardino Mountains.