The Akismet plugin for b2evolution checks feedback through a central service ( http://akismet.com ) against spaminess.
This plugin is no longer necessary for most users because similar functionality has been integrated into b2evolution's core. To add a list of comments to your sidebar, go to Blog Settings > Widgets > Add Widget and click on Comment List.
This plugin adds a widget that displays a list of recent comments in your sidebar.
Using this plugin you can display the ShareThis widget into the contents of your site and let your visitors share them to their preferred social networks and websites.
This plugin is supported by the current release but needs some fixes
The Captcha Image Plugin allows you to use Captcha images for comments and user registration, as a measure against automatic spam attacks.