A few projects of mine at github/gschueler.
nom - nom is “no markup xml”, kind of like Markdown for XML. (ruby and groovy implementations)
Use indentation and minimal formatting to generate XML or make XML readable again.
I use this tool all the time just to read XML easily in a terminal. Just do nom -rev < file.xml
to get a sightly view.
document
body attr=value attr2=value
:some text
<document><body attr2='value' attr='value'>some text</body></document>
CornerClick is literally my first app written in Objective-C for OS X, started in 2001. I still use it all day, every day.
It still works in Mountain Lion, but could stand for a new update.
You can assign actions to any corner of your screen, and invoke them with a click or just a gesture. Actions include: bring app to foreground, open URL, and even run AppleScript. You can choose modifier keys (hold down Option key) and use right-click.
Some more Groovy utilities: