Flipgrid is a great, asynchronous way to connect with classrooms around the world. Give your students a voice! Your students can use this platform to communicate their global ideas.
Empatico is a free tool that connects classrooms around the world. I used Empatico to have discussions about energy with other classrooms around the world.
Padlet allows students to post their ideas and thoughts in a online post-it fashion. Different classroom can post on the same board as long as they have the link. It is a great way to facilitate discussions in a non-threatening way.
Explore My Hero to “celebrate humanity one story at a time”. This website is full of the best of humanity and can inspire students to do the right thing. It is also contains lesson ideas for K-12 classrooms.