Dusk OS: 32-bit Forth OS. Useful during first stage of civilizational collapse
After civilizational collapse you won't need computers, you'll need bows, arrows and basic agricultural tools that don't require motors. Forget about electricity or anything requiring it, that will be the least of your problems. Assuming there is still sunlight enough to keep photosynthesis running. If not, you may want to find some place high.And if you are going to do something like this then you really should make it entirely self hosting and forget about networking and communities and such because by the time you need it those will all be gone and the best you'll be able to do is sneakernet. I hope your USB sticks will be EMP proof... papertape?