Robin W

This Plugin lets you add ranking elements to topics, replies and profiles in bbPress
These appear after the author details on each post and can show any or all of the following in ANY order
Total Topics eg ‘Topics : 78’ – you can set the wording and syntax 
Total Replies eg ‘Replies : 157’ – you can set the wording and syntax 
Total Count eg ‘Total posts : 135’ – you can set the wording and syntax 
Your name for that level – eg ‘ace contributer’ 
Some stars for that level – in the colour of your choice 
An image for that level – you can specify the size.
You can also style and add badges to users, such as ‘Key contributor’

bbp user ranking

This is awesome. Just what I was looking for. Thanks Robin.

Just what I was looking for

For bbPress - Lets you add ranking and badges to topics, replies, and profiles

This Plugin changes the ‘freshness ‘ that bbPress displays on topic and forum lists (eg 4 hours ago) to the date of the last post to that forum or topic (eg 17th January 2014 at 5.15pm).
It also allows you to set the heading for this new date format.
The existing (bbpress) Recent Topics widget works with date, but a revised Recent Replies Widget to display the date format called (Last Post) Recent Replies is included.

bbp last post

After trying to code things myself (to keep the number of plugins down), I found it easier simply to install this.

Very happy, it works perfectly

For bbPress - changes the freshness displays to date

bbp user ranking vs bbp last post