floss community

openprofessionals (well... the name says it all)
lilux (the lu lug)
luxcommons (lu creative commons (cc) initiative)
oswd (open source web design, where i got the design from)
jamendo (cc audio stuff)
ubuntu (my favorite gnu/linux distro)
gentoo (my second favorite ;)
wikipedia in luxembourgish (yes wikipedia exists in "letzeburgesch")
oasis (organization for the advancement of structured information standards, where the opendocument standard and much more comes from)

nice tools

hack.lu (a luxembourgish conference on bridging ethics and security in computer science)
csrrt-lu (computer security research and response team luxembourg)
clussil (club de la securite des systemes d'information luxemboug - the luxembourg is club)