Here are even more additions to The Best Websites For Learning About Martin Luther King, Jr.:
ESOL Courses has some ELL-accessible resources.
Digital Tools to Inspire Your Students on Martin Luther King, Jr. Day is from Facing History.
Four Resources for Exploring Media Literacy Through the Legacy of Dr. Martin Luther King Jr. is from KQED.
6 ways to meaningfully honor Martin Luther King Jr. Day is from Mashable.