Twitter BootStrap 3

APIReference / DescriptionLinkVisit
ComponentsOver a dozen reusable components built to provide iconography, dropdowns, input groups, navigation, alerts, and much more.http://getbootstrap.com/components/Go
Bootstrap GRID layoutBasic grid layouts to get you familiar with building within the Bootstrap grid system. Used for making 3 columns, 2 columns or unequal columns.http://getbootstrap.com/examples/grid/Go
GlyphiconsIncludes 200 glyphs in font format from the Glyphicon Halflings set.http://getbootstrap.com/components/#glyphiconsGo
DropdownsToggleable, contextual menu for displaying lists of links.http://getbootstrap.com/components/#dropdownsGo
Button groupsGroup a series of buttons together on a single line with the button group.http://getbootstrap.com/components/#btn-groupsGo
Button dropdownsUse any button to trigger a dropdown menu by placing it within a .btn-group and providing the proper menu markup.http://getbootstrap.com/components/#btn-dropdownsGo
Input groupsExtend form controls by adding text or buttons before, after, or on both sides of any text-based input.http://getbootstrap.com/components/#input-groupsGo
NavsNavs available in Bootstrap have shared markup, starting with the base .nav class, as well as shared states.http://getbootstrap.com/components/#navGo
NavbarNavbars are responsive meta components that serve as navigation headers for your application or site.http://getbootstrap.com/components/#navbarGo
BreadcrumbsIndicate the current page's location within a navigational hierarchy.http://getbootstrap.com/components/#breadcrumbsGo
PaginationProvide pagination links for your site or app with the multi-page pagination component.http://getbootstrap.com/components/#paginationGo
Labelshttp://getbootstrap.com/components/#labelsGo
BadgesEasily highlight new or unread items by adding a <span class="badge"> to links, Bootstrap navs, and more.http://getbootstrap.com/components/#badgesGo
JumbotronA lightweight, flexible component that can optionally extend the entire viewport to showcase key content on your site.http://getbootstrap.com/components/#jumbotronGo
Page headerA simple shell for an h1 to appropriately space out and segment sections of content on a page.http://getbootstrap.com/components/#page-headerGo
ThumbnailsExtend Bootstrap's grid system with the thumbnail component to easily display grids of images, videos, text, and more.http://getbootstrap.com/components/#thumbnailsGo
AlertsProvide contextual feedback messages for typical user actions with the handful of available and flexible alert messages.http://getbootstrap.com/components/#alertsGo
Progress barsProvide up-to-date feedback on the progress of a workflow or action with simple yet flexible progress bars.http://getbootstrap.com/components/#progressGo
Media objectAbstract object styles for building various types of componentshttp://getbootstrap.com/components/#mediaGo
List groupList groups are a flexible and powerful component for displaying not only simple lists of elements, but complex ones with custom content.http://getbootstrap.com/components/#list-groupGo
PanelsWhile not always necessary, sometimes you need to put your DOM in a box. For those situations, try the panel component.http://getbootstrap.com/components/#panelsGo
WellsUse the well as a simple effect on an element to give it an inset effect.http://getbootstrap.com/components/#wellsGo

Twitter BootStrap 2

APIReference / DescriptionLinkVisit
Dropdown menusToggleable, contextual menu for displaying lists of links.http://getbootstrap.com/2.3.2/components.html#dropdownsGo
Button groupshttp://getbootstrap.com/2.3.2/components.html#buttonGroupsGo
Button dropdown menushttp://getbootstrap.com/2.3.2/components.html#buttonDropdownsGo
Nav: tabs, pills, and listshttp://getbootstrap.com/2.3.2/components.html#navsGo
Navbarhttp://getbootstrap.com/2.3.2/components.html#navbarGo
Breadcrumbshttp://getbootstrap.com/2.3.2/components.html#breadcrumbsGo
Pagination http://getbootstrap.com/2.3.2/components.html#paginationGo
Labels and badgeshttp://getbootstrap.com/2.3.2/components.html#labels-badgesGo
Typographic componentshttp://getbootstrap.com/2.3.2/components.html#typographyGo
ThumbnailsGrids of images, videos, text, and morehttp://getbootstrap.com/2.3.2/components.html#thumbnailsGo
AlertsStyles for success, warning, and error messageshttp://getbootstrap.com/2.3.2/components.html#alertsGo
Progress barsFor loading, redirecting, or action statushttp://getbootstrap.com/2.3.2/components.html#progressGo
Media objecthttp://getbootstrap.com/2.3.2/components.html#mediaGo
Miscellaneous Lightweight utility componentshttp://getbootstrap.com/2.3.2/components.html#miscGo
Bootstrap Glyphiconshttp://marcoceppi.github.io/bootstrap-glyphicons/Go
2.3 ComponentsDozens of reusable components built to provide navigation, alerts, popovers, and more.http://getbootstrap.com/2.3.2/components.htmlGo