A site dedicated to helping parents raising atheists in a religious world. Although there is some useful content, the site looks a bit tired and doesn't seem to have had much new material added recently.
See Courtney on social media and at her blog. Always insightful and entertaining. Although wider than just parenting, she often covers topic related to raising atheist children.
This site really needs no introduction to most atheists. Founded by ex-muslim, Amin Navabi, it has become a wealth of information and resources for atheists across the globe.
Where to begin? Carl Sagan is person who has had an immense impact on my life. His philosophy on life and the universe is breathtaking, beautiful and humbling at the same time. Much of his life was dedicated to challenging pseudoscience and misinformation in a manner that was empathetic yet bold. His immense understanding of where we, as humans, have come from and are going to makes him he most notable figure of our times.