HEx's Guide to Languages

(Yes, I do of course mean programming languages. I also speak human languages, but I don't tend to learn dozens of them for fun.)

Languages I know and love

Otherwise known as "languages of choice". I've generally written a fair amount of code in them too.

C

Simple, concise, and as close to the bare metal as you can portably get. Lovely.
Perl

The antithesis to C in design, an amazingly useful language. Also, due to its ludicrously large feature set, a very fun language for golfing.
ARM code

The nicest machine language I've encountered. Mmmm, condition codes...

BBC BASIC V

This used to be a language of choice until I discovered *nix, C and later, Perl. Very good as BASICs go, but still lacking many vital features, including any form of memory management. Notable for its run-time assembler — a feature I have yet to encounter anywhere else.
m4

Useful but limited macro language. I learnt rather more about the limitations than I probably should have; m4 may not have been the ideal language for what I ended up using it for (HTML processing).
6502 machine code

Not-particularly-pleasant 8-bit architecture, with odd rules about index registers and such.

I've at least tried to program stuff in these languages (with varying degrees of success), but haven't explored them deeply.

Java

Pure evil in a monstrous, bloated, object-oriented package. Not a language I'd wish on anybody.
Scheme

Seems a pretty nice functional language.
Hope

It's been a while since I played with this; seems very ML-like. (Or vice-versa?)
dc

The stack-based calculator, included here because it is Turing-complete, and because I've written a rather nice graphics hack in it :)
SML
Befunge

One of the more bizarre obfuscated languages; great fun.
x86 machine code

Another not-particularly-pleasant (but nicer than 6502!) architecture, which is showing the strain of having to be backwards-compatible with 20-year-old code. Not nearly enough registers either.

Python
Forth
LISP
Microchip code

Or whatever the official name for the instruction set their PICs use is...