Tooltipster is a jquery tooltip plugin. you can use it very easy . you can add custom image , text , title.

aviket

MapTip

MapTip is a jquery tooltip plugin. It is used to display map of a city or place, when mouse is hovered over the city name. It very easy to use.

Md Rukon Shekh

Tooltipster is a jquery tooltip plugin. you can use it very easy . you can add custom image , text , title. 
it has 10+ features . 
example animation, position, title, text, image, speed, delay,icon ,theme, trigger etc.
How to Use
to Use Cteate a shortcode in your post like that
<h4>simple Activation</h4>
<pre>
[tooltip text="Your Tooltip text here"]
 Tooltip
[/tooltip]
</pre>
Add content with title, position
<pre>
[tooltip title="Helo World" position="top" text="Welcome to WordPress. This is your first post. Edit or delete it, then start blogging! This is an tooltips This is an tooltips"]This is an tooltips[/tooltip]
</pre>
More Options
<pre>
[tooltip title="Helo World" trigger='click' position="top" image="http://s27.postimg.org/4by9zrilr/logo.jpg" theme="tooltipster-light" text="Welcome to WordPress. This is your first post. Edit or delete it, then start blogging! This is an tooltips This is an tooltips"]
 This is an tooltips
[/tooltip]
</pre>

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