idiomatic.js : Principles of Writing Consistent, Idiomatic JavaScript
Vanilla List : The Vanilla Javascript Repository. A searchable repository of dependency-free JavaScript libraries. Over 100 projects and growing.
JavascriptOO : Every javascript project you should be looking into.
With examples, categories, install commands, CDN links, project and author stats, and more.
This is a collection of JavaScript wizardry that can shave bytes off of your code.