Were I to submit an entry this weekend, it would be my first Ludum Dare. It would use most or all of the following tools:

Code:
Python/Pygame
PGU
vim

Visuals:
GIMP
pen and paper
possibly some procedural content as well

Sound:
sfxr
ZynSubAddFX
Hydrogen
Audacity

Having only written very small (no more than 500 LOC) tools in Python, I’m far more comfortable with C++, but I figure it’d be easier to avoid cross platform hassle this way as I’ll be developing on Arch and occasionally Ubuntu. Plus, with PyWeek 11 starting up this weekend as well, I figure I could jump straight into it from here.

P. S. Despite the awkward name, if you haven’t tried ZynSubAddFX, you’re missing out. If I have time to add more than sound effects, it’ll come from this. I doubt I’ll have time to add Hydrogen into the mix, or require the services of Audacity, but I list them just in case.