When it comes to JavaScript-based multi-user chat clients for XMPP, Candy takes the cake. This chat client, aptly named "Candy," has been a go-to solution for real-time, multi-user chatting—before it sadly went out of maintenance. But don't let that dissuade you from giving this gem a look! Candy offers a straightforward, user-friendly interface, making it a snap to configure, run, and use. It's the perfect fit for anyone needing an immediate chat solution that's highly customizable. And for the tech-savvy folks out there, the beauty of Candy lies in its 100% well-documented JavaScript source code. You can tweak to your heart's content without ever feeling lost in the code. Originally built for Jabber (XMPP), Candy boasts robust support, having been tried and tested in live environments with up to 400 concurrent users. So, it’s no shy player—it’s a chat client bred for the big leagues. Compatibility won’t be an issue either; Candy works seamlessly across all major web browsers, including the finickier Internet Explorer 9. One of the neat features of Candy is its plugin repository. If the base functionality isn’t enough for your needs or you want to bring something new to the table, diving into plugins could open up a world of possibilities. Whether you're adding new features or contributing your own plugins, the community around Candy fosters a supportive environment for continuous improvement. Even though it’s no longer actively maintained, users can still find a wealth of information through the FAQ or the Google Groups Mailing list. The community support remains robust, ensuring that help is available if you're willing to join the conversation. Despite its dormant status, Candy is still a stellar example of a sleek, efficient, and highly customizable chat client worth exploring. It’s a piece of tech history that shows the potential of JavaScript-powered chat solutions. So, if you've got a hankering for some coding nostalgia or you’re looking for inspiration for your next project, give Candy a whirl. You might just find it as sweet as its name suggests.