OpenSceneGraph (GitHub: cedricpinson / osgjs, License: LGPL) by Cedric Pinson is a WebGL framework based on OpenSceneGraph -- a 3D API typically used in C++ OpenGL applications. This means it's possible for developers experienced with OpenSceneGraph to bring their projects across to a familiar environment that runs in modern browsers thanks to WebGL.
BroadStreet (GitHub: DarrenHurst / BroadStreet, License: MIT) by Darren Hurst is a set of controls for Backbone.js. It includes a list selector, iOS-style toggles and alerts, SVG icons, and labels.
Each control inherits from Backbone.View.extend, so the API looks like a standard Backbone object:
var toggle = new Toggle('controls', this).render();
The author recommends testing the project with a web server to avoid security restrictions caused when running the examples locally.
New docs, affix plugin, submenus on dropdowns, block buttons, image styles, fluid grid offsets, new navbar, increased font-size and line-height, 120+ closed bugs, and more. Go get it.
The Bootstrap homepage showcases the new features and has a slight redesign. Hopefully it'll inspire Bootstrap users to customise their projects a little bit instead of using the same black gradient navigation bar on every single project!