The arsenal:
Language: EcmaScript 6
ES6 -> JS Compiler: Babel
Import Roller: Rollup
Build System: Gulp
Engine: misson20000/ld35 (available on GitHub if you care, very similar to my ld34 code)
Graphics: Canvas2D WebGL!
Audio: WebAudio
Image Editor: The GIMP
Music Studio: LMMS
Sound Editor: Audacity
SFX Generator: One of those ‘FXRs
Code Editor: Emacs
Supported Browsers: Chrome, Firefox (IE? NEVER!)