Special thanks to COABE member, Jennifer Gagliardi for compiling this exhaustive list.
American English at State
Center for Civic Education
EL Civics
ESL Discussions
ESL Fast
elli (formerly ESL Library) (Requires subscription).
ESL Podcast: (Excellent resource for Advanced students. Requires subscription.)
ESOL Courses
First Literacy
iCivics (K12—adapt for AE)
Jennifer ESL
Kahoot.it
Learning Chocolate
Learning for Justice (K12—adapt for AE)
Linguahouse
Listen A Minute
MN Literacy
Newsela (K12—adapt for AE! Subscription Required)
Participate
Share America
Smithsonian Institute
StoryCorps
Study
Teachers Pay Teachers
TED-ED (K12—adapt for AE. Check video description for links to the lesson plans)
The Change Agent Magazine (Subscription required)
this i believe
USA.gov
US Citizenship Podcast
USCIS
Voice of America
We Speak NYC
Your Election Pal