jQuery UI Datepicker

Displays a calendar from an input or inline for selecting dates.

FullCalendar

Full-sized drag & drop event calendar

CLNDR

CLNDR is a calendar plugin that uses HTML templates, allowing you to write custom markup and styles that have access to useful calendar data.

jquery-timepicker

A jQuery timepicker plugin inspired by Google Calendar. It supports both mouse and keyboard navigation.

jQuery Date and Time picker

jQuery plugin for date, time, or datetime manipulation in form

PickMeUp

Really simple, powerful and customizable datepicker

Datepair.js

A plugin for intelligently selecting date and time ranges inspired by Google Calendar.

Bic Calendar

A simple twitter bootstrap calendar / agenda to mark events and select range of dates.

jQuery Timepicker

Enhances standard form input fields helping users to select (or type) times.

jQuery Continuous Calendar

Date picker and range selector with scrollable months instead of paged