Vanilla JavaScript Plugin

Component Picker  

An iPhone-style form field widget that can be used to select dates or whatever you pass into it.

Plugin Website  Demo

Related plugins

Rome date picker  

Customizable date and time picker. Rather lightweight, with optionally used jQuery UI styles.

datepickr  

A simple date picker. Works in IE10+ out of the box. Explanation provided on how to use it with IE 7 and above.

Stretchy Form Element Autosizing  

Auto-resize textareas, input fields and select boxes on update.