Twitter BootStrap 3

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

Twitter BootStrap 2

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Dropdown menusToggleable, contextual menu for displaying lists of links.
Button groups
Button dropdown menus
Nav: tabs, pills, and lists
Labels and badges
Typographic components
ThumbnailsGrids of images, videos, text, and more
AlertsStyles for success, warning, and error messages
Progress barsFor loading, redirecting, or action status
Media object
Miscellaneous Lightweight utility components
Bootstrap Glyphicons
2.3 ComponentsDozens of reusable components built to provide navigation, alerts, popovers, and more.