Godot
Graphics: Aseprite, Pyxel Edit (As necessary, since graphics are provided)
SFX: Bfxr, maybe lmms(I have it but have never played with it in depth)
Music: Beepbox, maybe Bosca Ceoil
Audio Editing: Audacity
Video Recording: OBS
Planning: Good ole pen and paper.
I'm new to development, so I'm very curious what everyone uses as well. Especially for design docs for larger projects(I like pen/paper for jams).