A quick post to mention that I will also be participating! Have done some jams before, among others one or two MiniLD’s, but never a full weekend of Ludum Dare! The tools I will use:

• SDL2, SDL_image, SDL_ttf, maybe SDL_mixer. So basically the SDL family of libaries
• My own utility library https://github.com/bobismijnnaam/nutsnbolts, which contains helper functions and classes for primarily SDL but a few other things as well (gamestates, string manipulation and such).
• Probably GIMP
• Audacity if I get that far
• vim and command line

I will also be participating in the on-site event in Enschede. Looking forward to the weekend!