There are a few that support bbPress, just add ‘bbPress’ to your search criteria at https://wordpress.org/extend/plugins/
I couldn’t find a working (simple) voting system for bbpress so I rolled my own:
Feature Requests
If it continues to work over the coming weeks I’ll clean up the code and share it.
great, would be good to load it to wordpress
+1 It would be great to have this as a plugin. Looks nice on your site.
I added this new Voting feature as part of the old GetShopped Support Forum plugin.
It was the quickest way I could get a support forum (resolved/unresolved) plus topic voting working together.
Here is the comment I made on the WordPress plugin repo site:
https://wordpress.org/support/topic/i-added-bbpress-voting-and-fixed-some-bugs-version-303?replies=1
Code is available on github. It’s not polished enough to be a standalone plugin just yet.
I have added a few new things:
1) topic voting
2) sidebar registration widget
3) copied the ‘resolved’ dropdown to near the submit button, so you can easily mark a topic as resolved while you are replying to it (much quicker!)
4) fixed a couple of potential bugs around permissions (ie: anyone could mark a thread resolved or assign a thread to someone etc..)
You can grab the code (and see the changes) from here: https://github.com/dtbaker/bbPress-Support-Forums
The voting and sidebar registration features can be seen in the demo here: http://ultimateclientmanager.com/forums/forum/feature-requests/
(I have modified some of the div tags/classes in this plugin to better support bootstrap, so it might look a bit funky on the standard bbPress install)
Cheers,
Dave
https://wordpress.org/plugins/bbpress-vip-support-plugin/
Awesome, thanks for sharing this 🙂
Nice plugin really good job! 🙂
Thanks for sharing this. Very helpful!
I had a couple of comments seeing that this is a work in progress. This may just be my install. But I noticed that non-admins could see the drop down but couldn’t actually successfully change the status of a post. I also think the sorting menus should be conditional on a support forum, not a voting forum.
Again. Thanks for sharing. I hope this feedback is useful.
I’ve updated the plugin to include a (very basic) paypal payment feature and the ability to mark topics as “accepted”. You have to manually update the topics when payments come in, I don’t have enough time to make any sort of PayPal IPN integration.
Code has been updated here: https://github.com/dtbaker/bbPress-Support-Forums ( warning, my paypal address is hard coded into includes/bbps-vote-functions.php )
Screenshots:
Main forum page, it sorts topics by “funds” then “accepted” then “votes”.

Admin topic page: you can vote, mark topic as accepted, and manually update payments.

User topic view, can vote (when logged in) and pay:

Live demo here: http://ultimateclientmanager.com/forums/forum/feature-requests/
I know this thread is super old, but I thought I would jump in here to let anybody (who stumble upon this thread) know that I developed a free plugin in the WordPress plugin directory that adds voting to bbPress. https://wordpress.org/plugins/bbp-voting/
Just like the OP found, there was nothing out there that offered this pretty common functionality to a bbPress forum, so I developed my own plugin to do it. I hope you like it!
This is a great plugin 🙂
Thanks, Robin! I’m glad you like it!
Thanks for the great job! Does this additive some performance impact, how you think? 🙂
Not much. It’s a pretty small plugin that has 1 javascript file and 1 css file which enqueue properly so they can be bundled and minified by your caching plugin if you have one. It also doesn’t introduce any CDN resources. So, I would say the performance impact of this plugin is negligible.