"AnswerGarden is a new minimalistic feedback tool. Use it for real time audience participation, online brainstorming and classroom feedback."
This site says that it is "by Iowans for Iowans" but many teachers and students can benefit from this free political curriculum
Curated Texts centered on various topics, such as insects, and leveled for Grades K-8
"The City X Project toolkit is the most educationally relevant introductory 3D printing and design thinking curriculum available for 8 to 12 year-olds. It is a detailed guide to facilitating the City X Project workshop with your own students. "
Downloadable slide templates
easily make your own comic with no signup or download