Vanilla List : The Vanilla Javascript Repository. A searchable repository of dependency-free JavaScript libraries. Over 100 projects and growing.
JSDB.io : JSDB is a collection of the best javascript libraries
Leaflet : A Modern, Lightweight Open-Source JavaScript Library for Interactive Maps
swfobject : SWFObject 2 offers two optimized Flash Player embed methods; a markup based approach and a method that relies on JavaScript & offers a JavaScript API ...
Headroom.js : Headroom.js is a lightweight, high-performance JS widget (with no dependencies!) that allows you to react to the user's scroll.
Every javascript project you should be looking into.
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