This is to help some of us find some common ground.
List the programming languages that you know at least some of.

I know some of
TI-Basic (duh)
http
Small basic
Java
C++

C
C++
Java
Ruby
GLSL
TI-BASIC
HP RPL (A more recent addition to the list)
z80 Assembly
x86 Assembly
ARM Assembly
SH4-A Assembly (To a lesser extent of the others)
Haskell (to a rather minor degree)

I don't know any languages useful for webpage/site development (besides Ruby + Rails), largely because I find web development to be a pretty boring chore.



?

Perhaps you meant HTML?

I know some:
C
TI-BASIC
HTML
CSS
Casio Basic
Lua

Hmm all I know is:
C (rather extensively)
C++ & C#
Ti-Basic
Perl
Ruby (enough to get by)
z80 (Started to learn it)

C
C++
PHP
JavaScript
FORTH
Lua
Python
GLSL
z80 Asm
SH4-A Asm
(old) VB
(little) Lisp
TI-BASIC (ti8x & m68k)
Prizm BASIC
Java (eww)
Bash

(self-made languages used for GlassOS-related projects)
gCAsm - gCAS3-tuned interpreted FORTH
gCasp - Lisp for gCAS3
gFORTHvm - serialized general-purpose FORTH

(Not listing markup languages, they aren't programming languages)

Why leave it at programming languages? Somewhat in order of experience.

Programming languages:

• C/C++
  
• Python
  
• (ba)sh
  
• Assembly variants
  
  • Z80
    
  • Nios II
    
  • ARM
    
  • AVR
    
  • PIC
    
  • x86(-64)
    
  • Blackfin
    
  • RX
    
  • SH
• C#
  
• VB ()
  
• Java
  
• Haskell
  
• TI-BASIC
  
• Verilog
  
• ECMAScript (JavaScript)
  
• MATLAB (Octave)
  
• Merthese?
  
• Ada
  
• Mathematica
  
• Lua
  
• PHP (debugging other peoples' broken code counts, right?)

Markup:

• (La)TeX
  
• HTML (+CSS)
  
• Markdown
  
• BBcode? ()

Natural languages (er, mostly):

• English
  
• German
  
• Japanese
  
• Na'vi

How does one program in HTTP?

I'm certainly no expert in any of these, but over the years I've coded in the following (roughly in order when I learnt them):

TI-Basic
Pascal
Z80 Assembly
HTML (not technically a programming language as mentioned earlier)
JavaScript
C
Java
Visual Basic
x68 Assembly
C++
C#
ASP (classic)
PHP

TI-Basic z80 and 68k
A little of z80 assembly
A bigger bit of Java
A smaller bit of Scala
C
Racket
A little of Axe
A little of Casio Basic

C
abit C++
ti basic
a bit axe

I know BASIC and C. That's it Everyone else knows so many more languages...

Don't worry, We all start somewhere.

English only but learning TI Basic from Kerm Martian's excellent book 'Programming the TI-83 Plus/TI-84 Plus'.

Tari made things easy for me, as my list is something of a subset of his.

Programming languages:

• C/C++
  
• Python
  
• (ba)sh
  
• Assembly variants
  
  • z80
    
  • x86(-64)
  
  
• Java
  
• Verilog
  
• ECMAScript (JavaScript)
  
• Lua
  
• LISP variants including AutoLISP
  
• Lush
  
• MATLAB (Octave)
  
• Perl
  
• PHP
  
• QBASIC
  
• TI-BASIC
  
• Markup:
  • (La)TeX
    
  • HTML up to 5 (+CSS up to 3)
    
  • AIML
    
  • BBcode? ()

Natural languages (er, mostly):

• English
  
• French
  
• Latin

I know in chronological order:

BASIC (old style like Apple II)
AppleScript
Python
C (++) (first used for wii)
TI BASIC z80
Objective-C (iOS, Mac less so)
a tiny bit of Java
Z80 Assembly

Let's see...

BASIC (learned on the Applesoft (Apple's modification of Microsoft 6502 BASIC) dialect)
Logo
RPG IV
C (and C++)
Visual Basic (both 6 and .NET, I know, I know)
JavaScript
TI-BASIC Z80
Python
HP FOCAL
(User) RPL
bash
A bit of 6502 asm
A bit of ARM asm

I'm sure I'm forgetting something.

I don't really want to participate in what basically amounts to a biggest-list contest, but I will state that Tari is clearly the winner because of:

That may be true, although it's pretty fun I sadly lost though, if it is a contest.

Just ti-basic although I am trying to learn more. Axe a bit

* TI-81/82/85/86 TI-BASIC
* TI-89/92+/V200 TI-BASIC
* TI-99/4A TI BASIC
* MS-DOS batch scripting (though it's been so long I don't really remember it now)
* QBasic
* Bash shell scripting
* In a technology education class in middle/jr. high school, briefly did some stuff with Legos in some form of LOGO, I think; wouldn't remember any of it now, though
* Tiny bit of 8080 ASM (dabbled in it, wrote a couple of very basic routines, almost no experience)
* Tiny bit of Z80 ASM (ditto; got distracted by my preference to 68k C)
* C
* Little bit of Javascript, sort of (just enough to write a few user scripts for my browser, have to frequently look up how to do things online)
* A bit of Perl (another of those languages I used the "learn by looking up how to do stuff on an as-needed basis" technique)
* Python (pretty fluent because that's my #1 favorite language)
* UserRPL/SysRPL (my second favorite programming languages )
* Merthese, if that counts

Wow, didn't realize the list would be so long. Wonder if I'm forgetting anything. And I'm not listing HTML and CSS, because they're not programming languages.