Hi,
To me currently the http://viking.sf.net/ redirects to http://viking.sourceforge.net/ which redicts to https://viking.sourceforge.io/ which redirects to https://sourceforge.net/p/viking/wikiallura/Main_Page which seems to work. (my Firefox does it in one go :-) ) -- Carles Pina i Estany https://carles.pina.cat