Markus Echterhoff

If you have a multisite setup, you normally cannot have the same bbPress forums across all sites of the network. Now you can.
Install this plugin and activate it on the main site and for each subsite that should use the main site’s forums, or network-activate to enable on all sub sites.
If you want both main site and sub site forums displayed on the sub site, set a different root slug and topics slug in the forum settings. After that, both slugs will be known on the sub site and display their respective forums.
BUT! There is a reason why you cannot normally do this and that is because the code base is not really supportive of it. I have monkey patched my way to the goal and I’m doing some evil black magic like hooking ‘query’ and running regular expressions on the query. All of this is only ever done to your forum pages, so be cool, give it a try. If it works for you: great. If it doesn’t: deactivate, relax, look for a different solution (or patch mine).
Profile Note: Profiles are not merged! Favorites, topics started etc show main/sub site only. If you want your users to see all their subscriptions in one place, you’ll have to write some custom code and likely patch my code too.
BuddyPress Note: It does work with network enabled BuddyPress, but they don’t play together nicely because of the BuddyPress/bbPress integration stuff. I have monkey patched this to work. If you do not have BuddyPress installed in /members/ you’ll have to monkey patch my monkey patch, please see the code. And as for the profiles: Same thing as with bbPress profiles.

Multisite bbPress Slave

Make sub sites use the main site's bbPress forums

Robin W

codejp3

This Plugin lets you style bbPress, and add display features.
You can change the forum styling for elements, letting you match (or contrast!) bbPress to your theme
Many features are available at the click of a button, such as creating vertical lists, adding create new topic links, hiding counts and much more.
<ul>
<li>Style font sizes colors etc. in forums and topics</li>
<li>Change forum display layouts</li>
<li>Add or take away forum elements, such as adding descriptions or removing ‘this forum contains..’</li>
<li>Change the forum order</li>
<li>Change the freshness display to date and time, or combination date and freshness</li>
<li>Change the breadcrumbs to alter or remove elements, or remove breadcrumbs completely</li>
<li>Add Create new Topic, Subscribe and Profile buttons, making navigation easier</li>
<li>Add login Register and profile to menus</li>
<li>Change forum role names or add role images</li>
<li>Amend subscription email headings and text</li>
<li>Amend the topic list order</li>
<li>Add topic previews to make topic navigation easier</li>
<li>Change how the topic and reply forms display – adding, removing or changing elements</li>
<li>Amend how profiles display and configure who sees them</li>
<li>Amend the search styling</li>
<li>Use additional shortcodes to improve how you display your forums and topics</li>
<li>Add an unread posts section so that users can easily see new topics and replies</li>
<li>Add a quote button to topics and replies</li>
<li>Add moderation tools to allow to to control </li>
<li>Add an unread posts section so that users can easily see new topics and replies</li>
<li>Use additional widgets to better display latest activity, or forum and topic information</li>
<li>Find a list of other useful bbPress related plugins</li>
<li>Let bbpress work with FSE themes
</li>
</ul>

bbp style pack


I've been a user of this plugin for years. It's a HUGE time-saver customizing the look-and-feel of bbPress forums and even adds some essential forum functions like subscriptions, moderation, and site integrations.



Disclosure: I've contributed code to this plugin, so of course my rating is biased. Don't take my word for it, just look at the swift responses in the support forum and the abundance of 5-star reviews.


Swiss Army Knife for bbPress

For bbPress - Lets you style bbPress, and add display features

Multisite bbPress Slave vs bbp style pack