A free FORTH intended for education and learning that runs on a $10 experimenter board from Texas Instruments. Also freely available are a Windows IDE and several demonstration programs.
FORTH is a tiny language, with only a few basic concepts, suitable for people who are new to computers. It found success in the 1980s mainly in embedded systems. It also has a proud history in space research and astronomy.
With this extremely inexpensive solution, a wide audience can now learn programming by doing.
Available at 4E4th Website