Arturo is a very interesting programming language that I am experimenting with. It is similar to Red and Rebol, but with a smaller collection of library functions. (A positive for me!).
Here is the download - it is 8 MB.Unzip anywhere, and then run artide.exe. Also have a look at the help file. For the first run, you might get a virus-check error.
and here is an example of pretty-printing, and incidentally detecting an error that Arturo does not highlight well.
Original file: print "hello World" a: (3 + d )) [ aaa [ bbb ccc ] ] Prettified file: print "hello World" a: (3 + d )) [ aaa [ bbb ccc ] ] Message: Warning - non-fatal: Possible unbalanced round () in line 2
The pretty-printer can be run without the editor, if you wish.