MediaWiki extensions
I've written several MediaWiki extensions, mainly for the CLUG Wiki. I don't think any of them are particularly beautiful or maintained, but they are an essential part of our wiki, and might be useful to somebody out there...
Category Gallery:
Written for ClugPark, this extension displays all the images in a category together, as a gallery.
Usage:
<category-gallery category="PicturesOfPenguins" resizewidth="50" width="60" height="60"><category-gallery>
Mailman subscribe links:
Written for the Mailing Lists page, this extension displays mailman subscribe forms.
Usage:
<mailman>http://lists.example.com/mailman/subscribe/foobar</mailman>
Obfuscate e-mail addresses:
Written for the Contact a Committee Member page. I use my own simple Javascript that replaces innerHTML and href when you mouse over an e-mail link. I think it's spambot-proof.
Usage:
<email domain="example.com">foobar</email>