Here are the top Charity review and selection organizations that focus on high-impact giving in the world. Circle Acts High-Impact Philanthropy (Canada) Center for High Impact Philanthropy (United States Philanthropy) Givewell Charity Review and Research (United States Philanthropy) Charity Clarity (United Kingdom Philanthropy) Imagine Canada (Canadian Philanthropy) ChangePath (Australian Philanthropy) Animal Charity Evaluators (United States Philanthropy)