In a nutshell: Once you’ve got a dataset you want to write a custom tool for (in this case, a custom tool that generates an iCal file), you visit the dataset page, and click “More tools…” in the dark grey toolbar along the top. Pick “Code your own tool”, and then either SSH in and write your code in the box remotely, or use swbox to clone or mount your box locally. If you need more help, email hello@scraperwiki.com and we’ll give you some pointers.

I’ve recently gone through this myself, to write a basic iCal exporter. Maybe I should blog about it!

Alternatively, you can submit a new tool request in our issue tracker, and depending how many other people say they’d like the same tool, it might get developed and released sometime soon.