Project Brazil - To Be Released May 31st

Fallout: Project Brazil is a free fan-made expansion for Fallout: New Vegas. In fact it has been over four years in the making. The mod will be released in three installments one after the other if everything goes as planned.

From the Project Brazil Nexus site:

Project Brazil tells the story of your player character, an adopted resident of Vault 18, on the night of the last big Vault-Ball game of the season. The consequences of your player’s decision to dodge or tackle Johnny Matheson shapes the rest of their life, playing as an computer Nerd or a popular Athlete. When the war finally reaches the Vault after one prominent figure turns out to be a member of the Enclave, a civil war erupts overnight, forcing the player to pick a side and escape into the wasteland with their rag-tag party of Robots and Friends.