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Trying to find the ones that have no in-arrows. I see: FORTRAN, B-0, Lisp, APL, SNOBOL, JOSS, ISWIM, Forth, sh, Prolog, sed, ML, B (not the predecessor of C, some other B, 1981), and Tcl. Did I miss any?

Sather, Icon, BASIC

No, all of those have in-arrows: Sather 0.1 has one from Eiffel 2, Icon has one from SL5, and BASIC has one from FORTRAN II and one from ALGOL 60.

DevParadigms: http://www.info.ucl.ac.be/~pvr/paradigmsDIAGRAMeng101.pdf

Thanks. That should really be the link instead of a 5 year old O'Reilly advertisement...

I could see Factor as a Forth offspring. (born 2003 according to Wikipedia)

And this `original source` looks like more correct and full.