Little Bit's is an electronics platform that is trying to make it simple for kids to build and create things using their little input/output electronics as the brain. The basic idea is that you connect a battery bit, and input bit (such as a touch sensor), and an output bit (like an LED). The bits are easy to connect through the built-in magnets and when connected the input bits action turns on the output.
Of course, with a platform like this, there are tons of bits! It can be confusing and hard to find the right project to do, and thankfully Little Bits is doing all they can to help with that. They are working to focus education on their Coding and STEM kits, and this update to the pro-library works to get aspects of both in the large school set that they sell to schools. The set now contains things like the LED matrix that students can code, and it has updated resources.
This set isn't cheap, but it gives you limitless possibilities. If you are serious about a maker space or you want kids to build instruments for their core classrooms, it's worth looking at. Check them out at littlebits.cc