Marcel Overdijk wrote
As long as my users don't have to login in my website end then again in the forum or other service Nabble is offering.
I don't know much about OpenID but I believe that at least one (initial) log in would be required at each of the separate sites.
If you're seeking an installable version of Nabble, please see for example <
http://n2.nabble.com/-Nabble-tp3010596p3016241.html>.