I teach an algorithmics course at a level equivalent to first year of college. I discovered LARP (sorry it's in french), a software that allows to draw organigrams, run them, debug them step by step and even generate pseudo-code from the organigram.
It is great as a first introduction to thinking logically without the burden of the syntax. Yet it's runnable, so they can easily catch mistakes.
Unfortunately it looks like it hasn't been maintained for a while. It doesn't run on Linux (with wine) and isn't open source, therefore I can't update it myself.
I am looking for an alternative that would allow the same basic features, but that would run on windows, Linux and mac. Bonus point if it's a free software.