SpheroEDU community hub is the go-to place for questions, suggestions and guidance on using Sphero robots and littleBits electronics in the classroom. This is a great place for ideas from other educators and creators on ways to incorporate Sphero into all subjects. This is also where to go to get feedback on code and help for students. I am both a contributor and moderator.
This is the community forum for developers building with the Misty Robotics platform. It has a lot of useful information and the best way to access professional developers to get their support when student projects reach beyond your knowledge. Everyone is very willing to help with something, especially if you explain you are a teacher working with students.
The home for creators using SparkFun products. This is my go-to for ideas, questions and support for projects using SparkFun electronics. This community is highly focused on the creation of physical computing devices. There are many wonderful projects/lessons for your classroom.
The VEX Robotics education site is the place to go for support teaching with VEX Robotics products, either in the classroom, or for competitive teams. There are a ton of ready-made lessons and activities for students of all ages to do, along with certification courses for teachers to improve their knowledge of robotics and computer science.
If you are a teacher wanting to start offering computer science in your classroom, this where to start. Aside from their nationally recognized and adopted FREE K-12 curriculums, Code.org provides support and professional development for educators of all levels. Differentiated lessons that can accommodate students of all backgrounds (including lessons for students without computers or internet access), Code.org is one of the best comprehensive resources available.
The Microsoft MakeCode platform is a versatile resource for teaching computer science and physical computing. From coding micro:Bit boards to video game design with Arcade, this resource is a useful community for lessons, curriculum, questions and support. Makecode also the coding interface for Minecraft Education Edition.
Computer Science Teachers Association is for any educator who offers computer science in their classrooms. This organization advocates for computer science in education and has written nationally adopted CSTA standards. This is a must-use network for all CS teachers to learn about different topics that we face in the classroom and outside in the community at-large.
Minecraft Education Community Hub provides curriculum, lessons, support and how-tos for using Minecraft Education Edition (MCE) platform in classrooms. I use MCE for computer science and robotics lessons, specifically in my video game design courses. This community connects content creators from across many disciplines inside and outside of education. I can find pre-made worlds, skin packs and support for lessons covering thousands of topics.
The Apple Teacher program provides many resources for teachers to integrate various applications into every subject in K-12 education. They also offer the “Everyone Can Code” and “Everyone Can Create” curriculums that provide a wide variety of creative lessons and projects for students of all ages to learn creation methods with mobile technology. They also host multiple Twitter AMA and EDU Chats for educators to collaborate on ideas and learn new practices using different applications. There is a lot of support for proper use of applications in the classroom and unique ways to get your students to move from content consumers to content creators.
ISTE is a must have community for any educator offering technology as part of their lessons. The nationally adopted ISTE Standards for Students and Educators have provided a framework for the best practices of the 21st century classroom. The forums linked here provide a wonderful resource for ideas, support and lessons for any teacher using technology with their strudents.