Speed JavaScript Resources provides a variety of fast, easy, and reliable ways to obtain yourself a JavaScript. The JavaScripts here are mostly written by its site developers, nicely organized and well commented.
A personal collection of JavaScripts that are rigorously tested on all JS capable browsers. If a script doesn't work in a certain browser, this is noted on the page. Main focus is on simple scripts that you'll need every day, with some explanations of common problems. Treated subjects: images, forms, frames and windows, events, DHTML, W3C DOM. Also contains the W3C DOM Compatibility Table, currently the best resource on the Internet for this subject.
This site offers a small collection of useful JavaScripts for your site. It offers backgrond effect, cookies, form validation, Web search, status bar text display, and more.
This site contains a number of javascript calculators for use in fluid mechanics and wave propagation as well as more general fields of engineering and science. The level of knowledge required is such that non-experts as well as specialists can benefit.