Shane Gowland

This plugin adds support for Topic Thumbnails with bbPress. It works by retrieving the first image from each topic and displaying it alongside the topic title on the index page. Thumbnails are sized according to the default ‘thumbnail’ size in your WordPress media settings. The images will also resize appropriately if you’re using a responsive WordPress theme.
This plugin works with GD bbPress Attachments and most other bbPress image management plugins.
If you enable this plugin while bbPress is disabled (or not installed) it will display a warning message.

bbPress Topic Thumbnails

Provides bbPress with support for topic thumbnails.

progpars.net

With this plugin you can last an IPB forum posts on your WordPress site to display.
Features:
<ul>
<li>Quick and easy to install and use</li>
<li>View Title Latest Posts Forum and latest reply and number visit and view member name on latest post</li>
<li>Setting database config on wordpress dashboard</li>
<li>Setting for showing latest posts on dashboard</li>
</ul>
Send email for Translation files: mahdi[at]progpars[dot].com 
for translate, please open langs/default.po by Poedit and translate strings.

bbPress Topic Thumbnails vs Ipb Last Topics