These don't all qualify as all being charities, but here it goes:

    • Watsi
    • Kiva
    • Doctors Without Borders
    • Canadian Blood Services
    • International Rescue Committee
    • Electronic Frontier Foundation
    • MIT Open Course-ware 
    • edX/MITx 
    • GiveWell
    • Charity Science
    • Against Malaria Foundation
    • World Wildlife Foundation 
    • Environmental Defense Fund
    • David Suzuki Foundation
    • LibreOffice
    • Evidence Action
    • GiveDirectly 
    • Oxfam
    • Gift of Life International
    • Bridge International Academies
    • St. Baldrick's Foundation (Childhood Cancer)
    • Innocence Project
    • The Marshall Project
    • Khan Academy
    • 3Blue1Brown