Недавно насобиралось:

Fbootstrapp
Fbootstrapp is a toolkit designed to kickstart development of facebook iframe apps in both relevant sizes. It includes base CSS and HTML for typography, forms, buttons, tables, grids, navigation, and more, styled in the typical facebook look and feel.
ckrack.github.com/fbootstrapp/

.Simpliste
cssr.ru/simpliste/ru.html

Foundation
An easy to use, powerful, and flexible framework for building prototypes and production code on any kind of device.
foundation.zurb.com/

Initializr is an HTML5 templates generator created by Jonathan Verrecchia to help you getting started with a new web project based on HTML5 Boilerplate. Initializr will generate for you a clean customizable template with just what you need to start!
www.initializr.com/

похоже все именитые компоненто-строители уже некоторое время как пилят свои javascript/html/css-компоненты:
KendoUI (by Telerik)
Wijmo (by ComponentOne)
NetAdvantage for jQuery (by Infragistics)

если кто еще чего знает, напишите плз

Каждый программист на javascript должен написать свою реализацию классов. ©

Dojo — dojotoolkit.org/reference-guide/dojo/declare.html#dojo-declare
Sencha (ExtJS) — www.rogerwilco.ru/2011/04/sencha-extjs.html
qooxdoo — qooxdoo.org/documentation/0.7/oo_feature_summary
MooTools — www.phpeveryday.com/articles/MooTools-Basic-Creating-Classes-MooTools-P919.html
Prototype — www.prototypejs.org/learn/class-inheritance
AtomJS — github.com/theshock/atomjs/blob/master/Docs/Class/Class.md
JSClass — jsclass.jcoglan.com/classes.html
code.google.com/p/jsclassextend/
github.com/jcoglan/js.class
Cobra — justin.harmonize.fm/index.php/2009/01/cobra-a-little-javascript-class-library/
github.com/JustinTulloss/cobra
The $class Library- www.uselesspickles.com/class_library/
Classy — classy.pocoo.org/
YUI 3 — www.yuiblog.com/blog/2010/01/06/inheritance-patterns-in-yui-3/
Coffee-Script — jashkenas.github.com/coffee-script/#classes
JavascriptClasses — code.google.com/p/javascript-classes/
AJS — amix.dk/blog/post/19038
jsFace — github.com/tannhu/jsface
JsOOP — jsoop.codeplex.com/
joot — code.google.com/p/joot/wiki/API
oopsjs — code.google.com/p/oopsjs/
Objs — github.com/tekool/objs/wiki
oorja — maxpert.github.com/oorja/
objx — code.google.com/p/objx/wiki/OClass
jsclassextend — code.google.com/p/jsclassextend/
prolificjs — code.google.com/p/prolificjs/wiki/OOP
objectize — code.google.com/p/objectize/

code.google.com/p/core-framework/wiki/Inheritance
code.google.com/p/sfjsoo/
code.google.com/p/jslproject/
code.google.com/p/magic-classes/wiki/MagicClassesOverview

github.com/ded/klass
github.com/jiem/my-class
github.com/kilhage/class.js
github.com/Jakobo/Sslac
github.com/BonsaiDen/neko.js
github.com/finscn/GT-Class
github.com/deadlyicon/klass.js
github.com/neuromantic/CodeJS
github.com/cj/js-oo
github.com/darthapo/klass.js
github.com/nemisj/zet.js
github.com/k33g/species
github.com/benekastah/JS-Class
github.com/tobeytailor/def.js
github.com/rstrobl/squeakyJS
github.com/shinyplasticbag/MojoClass
github.com/firejune/class
github.com/gcoguiec/jquery-class
github.com/daffl/JS.Class
github.com/pavelz/class.js
github.com/zerodogg/jqsimple-class
github.com/bnoguchi/class-js
github.com/arian/Klass
github.com/kuwabarahiroshi/joo
github.com/iamleppert/SimpleClass
github.com/aenoa/Noode.js
github.com/stomlinson/SuperClass
github.com/jzimmek/klazz
github.com/kbjr/class.js
github.com/jhnns/node.class
github.com/borysf/declare/blob/master/declare.js
github.com/ShadowCloud/BF-Class
github.com/pic-o/jsClass
github.com/rosamez/jquery.klass
github.com/yuki-kimoto/javascript-Class_Simple
github.com/yaksnrainbows/jarb
github.com/thirashima/UnderClass
github.com/arahaya/package.js
github.com/arieh/Class.def
github.com/bogdan-dumitru/jsClass
github.com/pomke/pomke.js
github.com/sgolasch/jClassify
github.com/kbjr/Classy
github.com/cthackers/jClass
github.com/davidjbeveridge/Clasico
github.com/edave64/protojazz
github.com/mrac/solid.js
github.com/benekastah/Classy
github.com/damianmr/JSMiniClass
github.com/benekastah/classesWithCash
github.com/dialog/Resig-Class
github.com/mpodriezov/OJS
github.com/dtinth/twcs.js
github.com/percyhanna/js-class
github.com/jalopez/SimpleClassJS
github.com/jhamlet/proteus
github.com/petebrowne/classify
github.com/TdroL/Classy.js
github.com/azendal/neon
github.com/aulizko/Alan-Point-JavaScript-Library/tree/master/src/oop