Client-side frameworks? I prefer to code from scratch as must as possible - Bootstrap, Foundation, etc are all bloated. They work well in team settings with different levels of experience - but that buttery, jank-free, 60fps, quick painting, etc come from knowing every line in your code. My Sass mixin game is good though.
The place I'm at is real developer friendly when it comes to stacks/frameworks on projects by letting the lead dev for that project decide (huge company so you're a project lead all the time). The client work is boring though - so I take the opportunity to just work on "process/devops" things. The last project I did was an SPA (a non-js fallback solution too) written in ES6 with Gulp, Babel, Libsass, Handlebars and a DigitalOcean Dokku qa/dev server for CI.
But the agile/scrum groupthink shyt and daily standups are just too much. I just want to code - not be in some ass hat's excel/word docs all day. I hate all the fukking calls too.
I'm a Linux (Arch Linux what up) hobbyist too, in addition to the web app stuff I do for a living. I'm researching/attempting to build my own Desktop (gtk based) and also trying to learn enough that I'll be able to start a Cross-Platform Native App framework like React Native that compiles into Native Apps for Cocoa, Universal Windows, GTK, QT, iOS and Android.