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WP2SMFBridge is a simple one way bridge from WordPress to Simple Machine Forum (v2 tested). This means, this one uses databases of SMF Forum and sync to WP database every time a user performs login or logout action in WP. To get this working only use WP to register/login/logout. Also, WP and SMF must be installed in same domain, and should not be being accessed through a subdomain, though it still work. For example, if your website contains of WordPress for news and SMF for forum, if your news is mydomain.com, then your forums should be somewhere like mydomain.com/forum.
This plugin will do these following tasks:
<ul>
<li>If a user log in WP, then that user will be logged in SMF.</li>
<li>If a user logout in WP, then that user will be logout in SMF.</li>
<li>If a user created/register/change password in WP, those actions happen on SMF!</li>
<li>Users that are created in SMF can be used once disabled WP plugin.</li>
<li>For a full way integration use with SMF2WPBridge plugin. 
https://github.com/xchwarze/SMF2WPBridge 
http://custom.simplemachines.org/mods/index.php?mod=4030</li>
</ul>
<h3>Notes</h3>
Every time a user logged in SMF forum, same username (will be created if not exist) will be logged in WordPress. Because SMF is placed in higher order, so user in WordPress will be changed to SMF with same role.
For example, you have an administrator named “admin” in wordpress, after WP2SMFBridge fully activated, the SMF user named “admin” can login as that administrator. So be careful!

WP2SMFBridge

Login bridge from Wordpress to Simple Machine Forum.

Edward Caissie

Plugin with multi-widget functionality that builds an SMF Forum RSS feed url by user option choices; and, displays a SMF forum feed. The widget includes the additional option to include in the feed: specific boards and/or specific categories. There are also check boxes to include the feed item date and the item summary, too.
NB: If updating from a version before 1.1 please make sure to re-save your widget options (check your feed type) for each instance after upgrading. This will set the feed type correctly using the new feed drop-down selection option. Thanks! ~cais 
* Copyright 2009-2015 Edward Caissie (email : edward.caissie@gmail.com)
This program is free software; you can redistribute it and/or modify 
 it under the terms of the GNU General Public License version 2, 
 as published by the Free Software Foundation.
You may NOT assume that you can use any other version of the GPL.
This program is distributed in the hope that it will be useful, 
 but WITHOUT ANY WARRANTY; without even the implied warranty of 
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 
 GNU General Public License for more details.
You should have received a copy of the GNU General Public License 
 along with this program; if not, write to the Free Software 
 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
The license for this software can also likely be found here: 
 http://www.gnu.org/licenses/gpl-2.0.html

BNS SMF Feeds

Plugin with multi-widget functionality that builds an SMF Forum RSS feed url by user option choices; and, displays a SMF forum feed.

WP2SMFBridge vs BNS SMF Feeds