I guess here's a list of my #GameDev tools:
Art - #PaintDotNet
MIDI - #AnvilStudio
WAV - #Pxtone
Audio - #Audacity
Programming - #Unity and #IKVM, #Eclipse, #VisualStudio (tools), #NotepadPlusPlus
Low-poly 3D environments - #Crocotile3D
Scriptwriting - #Trelby
CRT shaders - #RetroTVFX
NES sound - various, as it's always evolving, but #NTRQ, #FamiTracker, and #FCEUltra
GB sound - #LittleSoundDJ and #BGB

All of this is free software.

CRT testing - real CRT hardware via PS3 gallery or PC