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.
Because Learning - STEAM based learning
Microduino - cool lego-ish stuff
Tynker - coding platform for all ages and abilities
Replit.com - Coding in over 50 languages including Python & C++
WebEX Experiments with Google - Augmented & virtual reality