There was also the Sabre C interpreter, early releases of X11 and X10R4 came with the scripts to run it, it didn't do C++ though.

truth be told, Masaharu Goto wrote the CINT C++ interpreter at HP Japan and cern/root just embraced it and rolled it into its own floss distribution (F.R. was also an HP-CERN liaison for a very long time).

http://www.hanno.jp/gotom/Cint.html

(Saber-C, the Saber company has become Centerline, and the software itself has been renamed to CodeCenter. saber, xsaber, and sabertool have become codecenter, xcodecenter, and codetool. DEC offered Saber-C on ULTRIX. It never appeared to do very well in the marketplace, which is some kind of tragedy. It was, and is, a terrific piece of software. The fact that a product as useful as Saber-C could fail to do well in the market is an indicator of the impoverishment of software "engineering" practices industry-wide. Anyway, it ended up being ObjectCenter from Integrated Computer Solutions doing C++ and having an IDE with class browsing, with xobjectcenter)

@Create you are confusing. Did Saber-C end up being codecenter or xobjectcenter? Is the company Centerline or Integrated Computer Solutions. Who is F.R.?