The International Board on Books for Young People (IBBY)
http://www.ibby.org
IBBY is a non-profit organization which represents a global network of people from all over the world who are committed to bringing books and children together.
Little Pickle Press “What it Means to be Global”
http://info.littlepicklepress.com/lesson-plans-for-educators
A favorite online bookstore for kids. For Global program, see the lesson plans for grades 1-3.
Three Dot Dash
http://threedotdash.org
A Family Foundation created in response to 9/11 with a focus on identifying youth activists who work on a global scale and providing them recognition and support as a Global Team Leader.
Global Nomads
http://gng.org
Have a resource to add? Leave it in the comments!
Discover ECSL 
Nobis Project collaborates with and support educators in providing young people with an education that prepares them to become informed, active, caring and responsible global citizens, both at home and abroad. Nobis Project offers educators and schools professional development training, curriculum workshops, and global service-learning programs for educators. Our focus areas include cultural responsiveness, global citizenship, service-learning, and civic engagement.