My deck from Talk Web Design 2014 about the toolkit used by Front End Developers nowadays. Related resources:
https://medium.com/design-ux/799d16952a56
https://github.com/getdave/Frontend-Developers-Toolkit
http://www.paulirish.com/2012/talk-tooling-the-webapp-development-stack/
https://speakerdeck.com/addyosmani/automating-front-end-workflow
http://rmurphey.com/blog/2012/04/12/a-baseline-for-front-end-developers/
https://storify.com/onishiweb/front-end-tools