• Nice Titles Revised
  An improved Nice Titles Tooltip Script with Accesskeys support.
  
• A lightweight prototype based JavaScript tooltip
  
• Nice Titles
  A classic. The script uses a background image.
  
  

• AJAX-enabled Help-BalloonsHelp windows in baloon-design. AJAXified version is also available.
  
  

• jTip – A jQuery Tool Tip
  Extensive AJAX-based tooltips with numerous functions and presentation possibilities.
  
  

• jQuery plugin: Tooltip
  Enhances the jQuery Library.
  
  

• qTip
  Works for all elements, not only for links in most browsers - IE 5.5+, Firefox, Safari and Opera.
  
  

• Form field hints with CSS Tooltips
  It’s a basic example of how helpful a little JavaScript and CSS can be in a form. Instead of the input hints always showing and potentionally cluttering a very simple form, only the hint for the currently focused input will show. This article will show a way to do this.
  
  

• JS Tooltip
  Displays customizable tool tip message for each link element on a web page. A tool tip that can be added to the anchor element unobtrusively by adding a class value to it. This was done by having the tool tip message pull from the specific title attribute of the anchor element that the tool tip was added too.
  
  

• BoxOver
  Flexible DHTML-Tooltipp in numerous formats. Appears (almost) immedately and fades in during loading.
  
  
• SuperNotes
  Converts footnotes to tooltips. Appears immediately and can be assigned with a fixed position in the browser window.
  
  
• Tipster
  Multifunctional tool tips with JavaScript.
  
  

• 5 Tooltips by DHTMLGoodies
  First version is suppose to improve the usability of online forms:
  
  
• The second technique uses AJAX.
  
  
• Walter Zorns JavaScript, DHTML Tooltipps
  These tooltips can be used for different purposes; the code is well-documented and can easily be improved and modified.
  
  
• clueTip
  This is a demo page for the new clueTip — a jQuery-based, AJAX-powered tooltip. The clueTip plug-in was inspired by Cody Lindley’s jTip script.
  
  

• Mootools Tooltip
  Mootools Javascript example of using tooltips.
  
  

• Sweet Titles
  JavaScript Fading Tooltips.
  
• Hover Tip
  Tooltip with menu-like capabilities. The tooltip layer will remain visible while the viewer hovers over it. This allows you to place clickable links inside tooltip content.
  
  

• Multiline Tooltip with HTML, CSS and JavaScript
  This document explains how to make nice multiline tooltip for HTML documents, using simple and standard CSS, HTML and JavaScript.
  
  

• overLIB
  This JavaScript-library can be used in a variety of ways; many positioning and appearance features are available.
  
  

• Scriptaculous Effect.Tooltip
  The tooltip script from the script.aculo.us library.
  
  

• Tooltip.js
  Tooltipps with AJAX. The library uses the Prototype JavaScript Framework. The demo doesn’t work any longer.
  
  

CSS-Based Solutions

• CSS Tooltips
  A simple demonstration of using custom CSS tooltips as a drop-in replacement for the browser-based title attribute.
  
  

• CSS Technique for Tooltips
  CSS can create “faux tooltips” much the same as the JavaScript ones, but without all the (possibly) undesirable scripting. There are a few in’s and out’s involved, but surprisingly, the methods are rather easy to accomplish.
  
  

• Unobtrusive and Slightly Accessible CSS Tool Tips on Semi Transparent CSS Menus
  The scripts creates half-transparent tooltips with shadows.
  
  

• CSS Menu Descriptions
  This is a CSS technique that could be useful if you want to give users accessible added content such as tool-tips, notifications, or alerts, without adding unnecessary clutter to your page. And since it doesn’t rely of JavaScript, it should be useful to everyone, even disabled users.
  
  

• Balloon Tooltip Demonstration
  Balloon tooltip demonstration.
  
  

• CSS Tooltipps, lixlpixel Javascript Tooltips
  Similar scripts from the same source:
  
  
  
  
  

• CSS Rollovers for Tooltips
  
  
• CSS Bubble Tooltips
  This example will show you how well this tooltip stretches for long descriptions.
  
  

• Pure CSS Tooltips I

• Simple, accessible “more” links - v2
  CSS-based solution for displaying tooltips.
  
  

• CSS Tooltips
  Another solution, based only on CSS.
  
  

• Information Balloon PopUps
  Stu Nicholls delivers another CSS-based solutions.
  
  

Further Solutions

• Snap.com
  Snap gives you a visual preview of each result before you click on it. And that improves your odds of picking the right search, without clicking back-and-forth several times.
  
  

• DHTML Tooltips
  Popup a help tip or information layer onmouseover using this object-based DHTML tooltip code. The basic version, presented on this page, can contain plain text or rich html, images, or images and text. The tooltip can be displayed over a background image. It can move with mouse movement. And it is easy to customize and modify.
  
  
• Animated Tooltip Javascript

• DOM Tooltip
  DOM Tooltip Script-Library

• Yahoo! UI Library: Tooltip
  The Yahoo! UI Library Toolbox provides among other functions also tooltips.