kondis.no/ultra - premier ultra site, Norwegian
multidays.com - everything and more about ultrarunning
ultradistans.se - Swedish Ultra Runners Association
statistik.d-u-v.org/geteventlist.php - German organisation, results
club100.se - people who have visited 100 countries or more, Swedish

sak.se - Swedish Committee for Afghanistan

Maraton Antarctica - King George Island, Antarctica

biphome.spray.se/dan.stefan -  first site, 1998, never updated
www2.skolor.pedc.se/dekanen/matematik - second site, 2003, never updated
web.comhem.se/stefan1 - third site, 2006, the gax ultramarathons, discontinued
sites.google.com/site/gaxultra - fourth
site, 2011, the gax ultramarathons
sites.google.com/a/skola.malmo.se/pagy-filosofi-sa-bet/ - fifth site, 2013, philosophy