These are resources, not necessarily recommendations (though for some tools I've written a glowing review). Some are free and others are free to try then require purchase. Please check them out and decide for yourself if they will work in your classroom.
Allsides - looking at news sources and telling you whether they are L,C or R and offering another POV on the same topic for a different source.
Untold History - short videos that may not have been mentioned in the textbook
60 second civics - brief podcasts about civics
Constitute - Compare the constitutions of different countries over space and time
AllSides: Current events news stories from the left, right, and moderate perspectives
Embracerace.org: Tools and resources for teaching about all forms of racism, social justice and nurturing inclusivity
Voices of Democracy - " promotes the study of great speeches and debates in U.S. history "