@marcevers – Marc Evers is a lover of code quality and an agilista. He often posts about the interesting stuff he himself is reading. He is also one of the people whose presentations I always try to follow, along with his other colleagues from QWAN.

@westghost – Rob Westgeest is another lover of code quality and an agilista. Another QWAN-ese.

@most_alive – Willem van den Ende is the third member of the QWAN triumvirate.

@KathySierra – Kathy Sierra is an avid advocate of usability of software.

@javaposse – The Java Posse has their own Twitteraccount.

@nljug – The NL-JUG has a Twitter account too.