Fantasy by xkcd
This one can play Chess.
This is a tiny javaScript originating from an entry to the 2004 5k javaScript Chess competition where the goal was to write a chess playing script that was under 5kb in size. That's small. Nevertheless it plays reasonable. There are some quirks that can help you beat the program, but I'm not going to tell... One clear error is that it displays a move only when it calculated it's own (half) move. That leads to some chocking when playing in 'slow' mode, but also (this is the error) that it makes another move when it's checkmated (it will even take the piece!) Having played several low level Chess programs, this one isn't bad. But hey, It's for fun! You can download the p4wn_chess_plugin-0.9.zip zipfile. Install the plugin and add it to a post with the [ p4wn ] command.
I made some settings to allow it in a smaller bPost column than intended, so if it looks elongated beyond nice, do change that setting.
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Interesting link: p4wn.sourceforge.net/ with information and some of the history of the file.
Have fun
This plugin adds a dropdown to a list. Especially aimed at widgets. With the plugin enabled selected widgets are collapsed by default and will fold out when hovered.

When hovered with the mouse:

Play with the USER TOOLS next to this article. After you install the plugn the way you would install any other plugin, you wander to the widget settings (via Blog settings) of the widget you want to collapse. There you add "dropdown" to the field "CSS Class". That's all there is to it. You can enable this with as many widgets on a blog as you would like. This is how the settings look:

download: jquery_dropdown_plugin-1.1.zip Have fun