I’m probably going to use…

Scratch | scratch.mit.edu

Inkscape | inkscape.org

Audacity | audacityteam.org

SFXR | drpetter.se/project_sfxr.html

GIMP | gimp.org

OBS | obsproject.com

I’ll update this list if I want to add/remove a tool, and will list my tools at the end of the Compo.