These are national or international charities focused on literacy teaching, book distribution, and other activities that promote reading and writing. They are all highly rated by Charity Navigator. 

1. Book Trust

2. Books for Africa 

3. Children's Literacy Initiative

3. Ferst Readers

6. Room to Read

7. United Through Reading

8. Worldreader

One of the world’s premier literacy educators.

He studies reading and writing across all ages and abilities. Feel free to contact him.