We currently do not have an add-on for any forums but many of our other customers have shared that the BBPress.org plugin works well with WL Member as well as SimplePress (http://simplepressforum.com/) since they both the same user database as WL Member.
As long as you had a link to the forum on your blog, non-members wouldn’t be able to see it or access it without logging in first (if you used the hide/show feature).
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