Free Comics - let me know if you have others to add!
NASA comics - https://www.astrobio.net/nasa-astrobio-graphic-novels/
http://www.crmvet.org/docs/ms_for_comic.pdf - The Montgomery Story. This is a comic that was distributed during the US Civil Rights Movement and teaches the tents of non-violent resistance.
http://features.weather.com/us-climate-change/arkansas/ - Marshall Islands and climate change research. What will happen to the Pacific Islands as sea levels rise? Drawn by the amazing Nate Powell of March fame.
http://popcultureclassroom.org/education/colorful-history - This is created by Pop Culture Classroom - an amazing organization! I have written some of the lesson plans/teacher resources as well. These are based on people/events in US history - they can be used for any grade level.
http://www.magictorchcomics.co.uk/blog - this includes an amazing comic on Gallipoli in WWI
https://www.comixology.com/free-comics there are some freebies in with the paid comics
https://comicstore.marvel.com/free-comics- some freebies
http://comicbookplus.com - older comics that have entered the public domain - fascinating!
https://digitalcomicmuseum.com// - another for comics in the public domain
- Make a mini comic from one piece of paper! Posted by the Smithsonian!
https://t.co/FdPMeigPgC - Free Marvel comic teaching about the environment
http://www.diamondbookshelf.com/Home/1/1/20/1219 - Diamond Bookshelf Magazine. Great resource for educators and librarians. I have written several articles for them - how to get comics approved for the classroom, integrating historical fiction, and more.
/ - Fred Korematsu - Japanese-American Interment Camps