Ask HN: Hacker's List of Favorite FE Dev Tools

I'm having to do a lot of fe dev lately and would like to know what all you expert fe guys most favorite tools and libraries are? Currently, I'm using chrome for js debugging, less.js for more managable css, jquery as my stdlib, etc. But I'd like to have a list of your favorites so I can look at them and test them out. Also a powerful js unit tester would be nice! Thanks!