Choices.js is a lightweight, configurable selectbox / text input plugin. Similar to Select2 and Selectize.
Multipicker is jQuery plugin for selecting days, numbers or other elements, it supports multi selecting (like checkboxes) or single element selection (like radio buttons).
jQuery.inputmask is a jquery plugin which create an input mask. An inputmask helps the user with the input by ensuring a predefined format. This can be usefull for dates, numerics, phone numbers, ...
Switch is a simple and powerful iOS style switch for checkbox.
Trix is a WYSIWYG editor for writing messages, comments, articles, and lists—the simple documents most web apps are made of. It features a sophisticated document model, support for embedded attachments, and outputs terse and consistent HTML.
Jodit Editor is a beautiful and functional WYSIWYG HTML text editor with file browser out-of-box.
It's free for non-commercial use.
formBuilder is a jQuery plugin for drag and drop form creation.
pickList is a simple jQuery plugin that turns a regular multiple option select box into a side-by-side pick list with Bootstrap.
superplaceholder.js is a library to bring your input placeholders to life by cycling multiple instructions in a single input placeholder.
With Simple Select you can create custom styled select elements by using css and jQuery.