jQuery
For a long time I used Prototype for writing Javascript. I even played with MooTools and Dojo for a while to see if I liked them. I eventually landed on jQuery. I can’t see myself switching to any other framework either.
I don’t want to go out on a tangent about why I prefer jQuery over any of the other Javascript frameworks. I’ll leave that for everyone else in the Internet to discuss.
I have created a couple jQuery plugins and a couple jQuery extensions for you to download. Use the navigation on the right to view them.