http://cosmo.torun.pl/foswiki/bin/view/Main/WebRss
For other Foswiki webs, replace /Main/
with the name of the web:
http://cosmo.torun.pl/foswiki/bin/view/Cosmo/WebRss
http://cosmo.torun.pl/foswiki/bin/view/Main/WebRss
http://cosmo.torun.pl/foswiki/bin/view/Sandbox/WebRss
http://cosmo.torun.pl/foswiki/bin/view/System/WebRss