cld.js (License: BSD) by Janne Aukia is a language detection library, ported from the Compact Language Detector in Chromium using Emscripten. It should work in Node and browsers, and has a simple API for detecting languages:
var cld = require('./cld-min.js');
Presenteer.js (GitHub: willemmulder / Presenteer.js, License: CC BY-SA 3.0) by Willem Mulder is a presentation library that's based around a class that applies CSS3 transforms and transitions to a set of elements:
var presentation = new Presenteer('#presentation', $('#presentation > div'));
The presentation instance can then be interacted with using the mouse, or programatically with methods like presentation.start() and presentation.next(). The nice thing about this API is multiple presentations can be displayed on a page.
Algorithmic MochiKit Extensions
Fredrik Blomqvist sent in his functional programming extensions for MochiKit. It includes an alternative bind method inspired by the one in the Boost C++ library that supports placeholder arguments. Other methods have also been extended to include placeholder arguments.
Fredrik has written several other MochiKit modules, inspired by Python: