menu-aim is a jQuery plugin for making responsive mega dropdowns like Amazon's.
BsMultiSelect is a lightweight multiselect plugin for Bootstrap 4. It converts multi-select list into dropdown with checkboxes.
Ergo Menu is a jQuery dropdown menu plugin that takes a regular
UL list and transforms it into either an expanding menu, or standard dropdown menu.
Dropdown Tree is a dynamic dropdown menu, based on Bootstrap and jQuery with click handlers, data handlers. You can select single or multi items, and can bind remote data with ajax request.
Dropdown is a lightweight jQuery dropdown plugin that supports key/value search and has multiple selection option.
SweetDropdown is a jQuery plugin to create dropdowns in any direction with any kind of content.
Select2 Cascade is a jQuery plugin to create cascading /dependent select list by using Select2 - one of the most popular select list plugin.
Bootstrap Dropdown Slidemorph Menu inspired by Youtube context menus within a video player. Transitions between submenus create very neat experience. Also, menu provides information about selected values for each item.
vDrop is a minimalistic and customisable jQuery plugin to replace standard HTML select dropdowns.
Pretty Dropdowns is a simple, lightweight jQuery plugin that converts
<select> drop-down menus into "pretty" menus that you can style using CSS. As an extra bonus, it does its best to keep the menu options within the viewport.
A morphing dropdown that animates according to the size of its content by using css and jQuery as seen on stripe.com website.
A tutorial about creating card deck style dropdown by using CSS3 transitions and jQuery.
Combodate is a jQuery plugin to create dropdown date and time picker. This plugin converts
<input type="text"> into dropdown elements to pick day, month, year, hour, minutes and seconds.
Dependent Dropdown is a jQuery plugin that enables to add and control multi level dependent dropdown lists. It works both with normal select options and select with optgroups as well.