Programming languages I have mostly used in recent years:

• C (not to be confused with C++) – because, Unix/Linux system programming.
• Ruby – it’s simply the best scripting language. It makes you happy.
• (Bourne) shell scripts – because you have to. (See C above)

Other languages I know, but not used very much recently:

• C++ (not to be confused with C)
• Java
• Common Lisp
• Prolog

Some languages I have dabbled with but don’t know very well:

• Javascript
• Perl
• Python
• PHP

Some languages I knew a long time ago:

• BASIC – on PDP-8 and ABC-80
• fig-Forth
• Pascal
• FORTRAN
• OPS5 – a rule based production system language
• *Lisp – or “StarLisp”, for SIMD Connection Machines
• Sendmail configuration (yes, it’s a programming language, sort of)

… and probably a few more I have forgotten.

There were also assemblers a long time ago: Z80, 68000, PDP-10.