Powerful Single & Multiple Select Library – tail.select
tail.select is a rewritten version of the jQuery tail.select plugin that can be used to beautify & enhance the default select box with no dependency.
JavaScript & CSS dropdown
Bootstrap Style Searchable Dropdown Plugin – fstdropdown
The fstdropdown JavaScript plugin turns a normal select element into a searchable, Bootstrap style drop-down select with pure JavaScript and CSS.
Multi-select Dropdown Component For JavaScript – slim-select
slim-select is a small and dependency-free JavaScript plugin for creating a searchable, multi-selectable dropdown list from a regular select element.
Accessible Custom Dropdown Menu – dropmic
dropmic is a tiny, zero-dependency JS library that appends a minimal clean dropdown/popup menu to any element when triggered.
Elegant Select Element Replacement In Pure JavaScript – vanilla-select
vanilla-select is a pure vanilla JavaScript plugin used for rendering a dynamic, searchable dropdown list/menu to replace the native select box.
Custom Dropdown Select In Pure JavaScript – custom-select
custom-select is small and dependency-free JavaScript library helps you create custom, animated dropdown list from the native select element.
Minimalist Dropdown Box In Pure JavaScript – dropdown.js
dropdown.js is a really small JavaScript library that appends an easy-to-style dropdown list to any element when clicked.
Configurable Multi-level Dropdown Menu Library – Contextmenu
Contextmenu.js is a lightweight vanilla JavaScript library for generating dynamic multi-level dropdown menu from plain html and JavaScript.
Custom Select Dropdown with Live Filter – Selectem
Selectem is a lightweight JavaScript library for create a custom CSS3 animated select dropdown with a live filter.
Material Inspired Animated Dropdown Menu
A Material Design inspired animated dropdown menu that uses CSS3 transitions & transforms for menu open / close animations.