the Home page indicates on the right top, the available versions of ServiceMix (6.x) and the left menu reference an older version (5.0.x)
I think there should reference the same branch.
Also in the ServiceMix 5.6.0 released section are shown the version of ActiveMQ, Camel, Karaf ...
This version 5.6 does not correspond to the specified documentation. the doc is 5.x and not 5.0.x
but when you open the karaf.org site, the 2.x branch is no longer present.
I think it would be good to warn the user that the version of karaf used is the status "not active" and put a link to the karaf documentation that is no longer listed on the karaf site