Toolgif is a lightweight and very simple jQuery gif tooltip plugin. Also there area some options for customize tooltip.
Popper.js is a library used to create poppers in web applications. Common examples of poppers are tooltips and popovers.
Marginotes takes your jQuery selection and adds notes to the margin with the text provided in HTML attributes.
Zebra_Tooltips is a lightweight jQuery tooltip plugin for creating simple, smart and visually attractive tooltips with nice transitions and configuration options.
Protip is a new generation jQuery tooltip plugin for any situation.
jQuery.mousetip is a lightweight jQuery plugin for creating cursor tooltips that follow mouse movement and position.
TinyTip is a very small tooltip jQuery plugin without using CSS. TinyTip does not force any styling over your tooltips, you can style your tooltips as desired.
It also allow you to display any content, texts, html and Dom elements inside your tooltips.
Tipso is a simple jQuery tooltip plugin that displays a responsive, animated, fully customizable tooltip when the visitor hovers over (or clicks on) the matched element.
awTooltip is a tooltip plugin created with css and jQuery. It's possible to show tooltips right, left, top or bottom of the elements. Also you can use colorful tooltip styles.
A drop in extension replacing error labels from jQuery Validation plugin with Bootstrap tooltips.
Stackbox is a jQuery plugin for creating stackable modal boxes. It's also easy to customize using CSS / LESS.