There are at least 5:

https://www.xmlprague.cz/ https://www.balisage.net/ https://declarative.amsterdam/ https://markupuk.org/ https://xmlsummerschool.org/

There's some interesting papers in the balisage archives.

I didn't expect to see my own country (The Netherlands).

You might want to look at http://www.elasticsearch.org/ Elastic Search is not to be confused with Elastic Compute Cloud. Elastic Search is a Lucene-based NoSQL-like search engine. You install it on your own machines.

Making Software http://shop.oreilly.com/product/9780596808303.do

Nice one.

There's a similar project in Haskell, by the way, called gitit: http://gitit.johnmacfarlane.net/

It looks like it doesn't work on the iPad: I can't get a cursor to appear.

That could be because contenteditable doesn't work on iOS (but you can style a textarea any way you want).