If I'm picking just one it would be webpack. It might not be sexy but it wrangles so much complexity out of my projects - files for disparate technologies (JS,

If I'm picking just one it would be webpack. It might not be sexy but it wrangles so much complexity out of my projects - files for disparate technologies (JS, CSS, Vue.js templates, CSV, whatever) can all declare dependencies against one another, and somehow each one gets parsed and bundled and minimized the way it needs to be. It's pretty glorious. https://webpack.github.io/ https://webpack.github.io/