The “Cangurul” (Kangaroo) environment for learning algorithms — a program written with simple commands makes the kangaroo hop around the field and draw lines.
Software
Educational programs for computer-science classes — free, open-source, for Windows, macOS, and Linux.
The “Furnica” (Ant) executor for learning algorithms — students write a program and the ant runs it on a table of letters, pushing the letters out of its way.