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With the addition of Simplified Scripting, there's not going to be a bunch of current scripts and packages, but you can try the nexus wiki for examples and ideas for scripts (http://nexus.ironrealms.com).
Perhaps I'm wrong, but I would be mildly surprised if anyone had taken a significant amount of time to write up scripts for the HTML5 client. For the most part, its kind of considered a gateway client, and most people who seriously play the game use the Mudlet client, which codes in lua. You'll have no trouble finding scripts to do various things on Mudlet.That said, would be glad to have someone prove me wrong!