binutils: C compiler utilities                                             [REC]
clisp:    a Common Lisp interpreter                                        [OPT]
f2c:      a Fortran to C translator (the C can then be compiled with GCC)  [OPT]
inc442:   the include files for libc                                       [REC]
zcfix:    miscelaneous fixes and patches for SLS                           [IMP]
perl:     Larry Wall's interpreted systems language                        [REC]