One of my worst loves on the internet for responsive, mobile-first frameworks. I use Bootstrap combined with Material Bootstrap to quickly create material, responsive, beautiful websites. Although this website isn't using Material Bootstrap, most of mine do!
My perfered modern text editor besides Vim, it's light weight, hackable to the core, open-source and allows you to one-click install from a list of thousands of amazing plugins. Want to compile your project to C++ using a key? There's an Atom package. Want to run a PHP server in a certain directory? There's an Atom package. Want to beautify HTML? There's an Atom package.
This isn't quite a public tool... It's mine I admit... Thou I use it for all large-scale websites I've ever made, it's flexible, based around the SPA model for url manipulation, built for an efficient PHP backend using an MVC system routed from a router, router sanitizer, custom database connection language (PSM) which is also mine!, large data pipeline builder, large set of usable modules, and more!...