It’s a bit out of date- but ForumMatrix: http://www.forummatrix.org/ allows you to compare feature sets.
Looking for info on top forums using bbpress (most specifically- if Mozilla forums were using it)- and find the links to a sort of cryptic message saying that this moderator has been removed and that the development is slowing:
“The bbPress Showcase has been discontinued.
The removal of Sam Bauers and the halting of bbpress.org 2.0
was a clear and final sign that there is no interest in allowing
bbPress to become a mature, robust program and community.
By now bbPress 1.5 could have been in alpha but instead
bbPress development has been deliberately stagnated,
which should be a very alarming warning to everyone.
In addition, bbShowcase had only six donations in 2009,
which indicated to me there was no interest in my work.
My code will remain on bbpress.org as open source GPL
for those that wish to use it, however I caution you to
consider bbPress’s lack of leadership before continuing to use it.”
What gives?