Hi, we almost always require employees to work from our Oxford offices, though you could submit an application and add a comment saying that you'd have to work remotely. However, Giving What We Can has opportunities for remote volunteers - if you're interested see http://givingwhatwecan.org/getting-involved/volunteer-with-us
I recently posted on LessWrong main about the jobs and internships currently available at the Centre for Effective Altruism. (As I mentioned, effective altruism in general and CEA in particular have been discussed many times on LessWrong, so these opportunities might be of interest to some readers!) We're just starting a new project to do effective altruism outreach and 'marketing' (much like what Peter Hurford discusses in this post), so have added some new roles in this to the recruitment round; there's a full description of them here. If you're interested, apply by 5pm GMT on February 28th, and if you know anyone who might be, do pass it along!