Sometime Today, Devdas Bhagat assembled some asciibets to say:
of 238 different languages.
List them ;) I know of assembly, C, C++, C--, C#, VB, VB script, Java, Javascript, Perl, Python, PHP, D, Ruby, BCPL, COBOL, Ada, Fortran, scheme, smalltalk, lisp, emacslisp, pascal, delphi, VJ++, shell. What else?
Check the acm archives. They have a list there somewhere. Anyway, among the popular ones that you've missed (though not all can do rot13) are JScript, VB.Net (different from VB), html (I can say hello world in that), dos shell, Foxpro (XBase actually), SQL, D2K, and more I can't think of now. There are also obscure ones like BrainF*ck, and less known, but well used ones like pike (used in Plan 9).
Philip