cambridge - 1cc?
s. africa - where?
Club MaMa (Zagreb?) (Marcell, Tomi, ...)
Kiberpipa (http://www.kiberpipa.org/) in Ljubljana
Ljudmila.org (http://www.ljudmila.org) in Ljubljana of early net.art
fame (they are though public lead in Slovenian CC)
AKT in Cakovec (small place in the north of Croatia: grassroots activism, free software and culture)
Monteparadiso Hacklab in Pula (http://www.fazan.org/) - have a free music label and are a typical hacktivist group (http://netlabel.monteparadiso.org)
Kuda.org (http://www.kuda.org/) in Novi Sad
Dom omladine in Belgrade - a huge cultural center, where Serbian Free Culture a.k.a. Slododna kultura (http://www.slobodnakultura.org) group has regular activities (Nena Antic, Vladimir Jeric - Vlidi [of Darkwood Dub], Vladimir Jeremic & Milos R (wmf)
Tocka (http://www.kontrapunkt-mk.org/) in Skopje and Free Software group (http://www.slobodensoftver.org.mk/)