Hello, Dennis.

Maybe it is RDE.
You can get it from below

RAA
http://www.ruby-lang.org/en/raa-list.rhtml?name=RDE%28Ruby+Development+Environment%29
Homepage
http://homepage2.nifty.com/sakazuki/rde_e.html
SourceForge
https://sourceforge.net/projects/rubyde/

Thanks.

# I planned to release next version during June.

> A few weeks ago I recall an email message on this list regarding a
> fairly stable, useable GUI-based source level debugger for debugging
> Ruby programs, which runs under Windows.  I believe it was written
> by a Japanese engineer, although I may be wrong.  The email message
> gave the URL address for this debugger, and I thought that I had
> saved it as a bookmark, but evidently I am mistaken, as I can no
> longer locate it.  If the author, or any other list participant can
> give me the URL for this debugger, I'd very much appreciate it.
> I'm trying to sell Ruby to my management as a viable option for future
> projects, and the availability of a source level debugger would be
> a big plus.  Thanks alot, and take care.
> 
> Dennis

---- sakazuki (QZS01353 / nifty.ne.jp)  ----