Select2 is a jQuery based replacement for select boxes. It supports searching, remote data sets, and infinite scrolling of results.
Tooltip, popover, dropdown, and menu library
BunnyJS - Lightweight native (vanilla) JavaScript (JS) and ECMAScript 6 (ES6) browser library, package of small stand-alone components without dependencies: FormData, upload, image preview, HTML5 validation, Autocomplete, Dropdown, Calendar, Datepicker, Ajax, Datatable, Pagination, URL, Template engine, Element positioning, smooth scrolling, routing, inversion of control and more. Simple syntax and architecture. Next generation jQuery and front-end framework. Documentation and examples available.
A lightweight library for building beautiful styleable <select> elements
Modular and light-weight selection library
Pure JavaScript multi-level drop-down menu.
A multi-selection dropdown plugin made in vanilla javascript
An importable module for JavaScript drop down menus