Dynamic Drive 
This unique site offers plenty of free, original Dynamic HTML scripts and components to enhance your Web site. An emerging medium, DHTML is an advanced form of JavaScript that can really make your Web pages come alive. Categories here include menus & navigation systems, document effects, scrollers, image effects, links & buttons, clocks, text animations and more.

JunkMachine 
This popular free service allows you to easily create your own cool, eye-catching Java applets for your Web site. No knowledge of Java programming is required. The JunkMachine will generate HTML code that you can simply cut and paste onto your site. You can either use this applet at this site or download the necessary .class files and run the applet locally .

Java-Scripts
An informative, well-designed JavaScript resource. Each script is described and has instructions for implementation. Categories include scripts for browsers, forms, frames, images, links, timing and windows.

ScriptDungeon.com 
This site offers many helpful free resources for Webmasters and network administrators, including JavaScript, utilities and tools. The free code here includes PHP, Active Server Pages (ASP), and more.