Stephanie Leary

This plugin appends the author’s display name to posts and/or pages. There is an option to turn off the display on your own site, so the signature is visible only in feeds and crossposted content.

Post Signature

Appends the post author's display name to posts. Useful for multi-author blogs that are crossposted elsewhere, such as LiveJournal or Facebook.

skipstorm

This plugins adds a widget with the latest posts from your phpbb3 forum. 
To make it work you have to add a file on your forum directory wich is easily configurable to fetch the posts from a specific category or the whole forum. 
This plugins supports multiple istances so you can display topics from different forums or categories in multiple widgets.

Sk Latest Post Widget

This plugins adds a widget with the latest posts from your forum.

Post Signature vs Sk Latest Post Widget