AMF: The Against Malaria Foundation (AMF) is a non-profit that funds the distribution of long-lasting insecticidal nets (LLIN) to areas with high incidence of malaria, mostly in Africa. GiveWell has recommended AMF as a top charity several times. As of 2017, GiveWell estimated that it costs AMF about $4.22 to distribute one LLIN and $3,000 per equivalent under-5 year old life saved.
Animal Charity Evaluators investigates the most effective ways of reducing non-human animal suffering. Since there are many non-human animals living in extremely painful conditions on factory farms, animal suffering could be a very highly effective altruistic cause.
CEA: The Centre for Effective Altruism (CEA) is a coalition of projects related to EA. Giving What We Can and 80,000 Hours are both part of CEA. They also run the Global Priorities Project and other special projects and raise public awareness of EA.
Center for Applied Rationality runs 4 day workshops on, no surprises here, rationality. They often give significant discounts to effective altruists, and a lot of people report benefiting from their workshops.
Effective Altruism Ventures is a VC fund designed for incubating projects that create a lot of social value.
FHI: The Future of Humanity Institute (FHI) is a research center at Oxford that is a leading producer of research on existential risk. FHI’s main areas of research are global catastrophic risk, applied epistemology, human enhancement, and future technologies.
GWWC: Giving What We Can (GWWC) is an international society dedicated to eradicating extreme poverty. GWWC recommends cost-effective charities and encourages individuals to sign its pledge, which represents a commitment to donate a fraction of one’s income to effective charities.
MIRI: The Machine Intelligence Research Institute (MIRI) is an non-profit whose mission is to “ensure that the creation of smarter-than-human intelligence has a positive impact.” MIRI’s main activity is to conduct research on a topics such as: How can a machine reason coherently about its own behavior? What is a better formalization for decision-making under uncertainty? How can we specify an AI’s goals to ensure that it matches our intentions, even as the AI modifies itself? What AI-related interventions are the most beneficial?
Raising for Effective Giving, a project from EAF, encourages touring poker players to donate 2% of their winnings to effective charity (which sometimes totals tens of millions).
Rethink Charity, formerly known as .impact, runs a lineup of EA initiatives that facilitate interpersonal engagement from the bottom up. Initiatives include LEAN (the Local Effective Altruism Network), the EA Hub, Students for High Impact Charity (SHIC), and RC Forward (Canada’s first cause-neutral donation routing fund for high-impact charities).
SCI: The Schistosomiasis Control Initiative (SCI) is a non-profit that works with local Ministries of Health across sub-Saharan Africa to treat children and at-risk adults for schistosomiasis and other parasitic worms. GiveWell has recommended SCI as a top charity, and in 2013, estimated that it costs $0.80 to deworm one child, with SCI paying about 70% of these costs (see “leveraging donations”).
TLYCS: The Life You Can Save (TLYCS) is a non-profit founded by philosopher Peter Singer. It promotes effective giving – with a focus on reducing poverty and economic inequality – through public outreach. TLYCS seeks to create local groups of informed givers and a global online community, and encourages individuals to sign its charitable-donation pledge.
Several organizations are focused on existential risk and the far future of humanity. The Future of Humanity Institute (FHI), the Centre for the Study of Existential Risk (CSER), and the Future of Life Institute (FLI) use the tools of mathematics, philosophy, and science to research big-picture questions about the future of humankind.
Additionally, many individual writers and other sites have interesting material on effective altruism, some of which can be found here.