This total transformation mod (not following Fallout lore) aims to bring to life anarchist utopias after Global meltdown. It takes place in eastern part of former Canada and United-States. The game is a bilingual (french & english) single player non-linear RPG. It can be called a radical camping simulator or a positive post-apocalyptic game. The world has been challenged by the Sum of all heavily anticipated catastrophies. Humans survived and organised themselves according to a mix of anarchistic, aboriginal, technological and nomadic ways of living, mostly driven by anarchist ideas (anti-domination, direct democracy, freedom and autonomy). In-game, "Sum" refers to the sum of all catastrophies, a cult, a currency and mispellings of words "son" and "sun". The Sum (french version : Nous Aurons) is an art project created by the french-canadian artist Hugo Nadeau (www.hugonadeau.com).
Here's a very entertaining and funny presentation of The Sum by Warlockracy, that received quite a lot of attention on Youtube... It is reviewing the current Alpha version (1.5.6) of the game.