From B2evolution

[edit] What are plugins?

Plugins allow you to enhance your b2evolution experience. They provide additional functionality by hooking into slots that are provided by the b2evolution core.

This way, the application can easily get extended without modifying its PHP files directly.

[edit] Installing a plugin

To install a plugin (in Phoenix), you simply have to put it (the subdirectory or single file) into the plugins/ folder. After that, you have to go to the Settings tab and install it from the list of "Available Plugins".

Some plugins might not get enabled right away, but need further configuration. You should receive a note about this then.

[edit] Where to get plugins

We have a repository at http://plugins.b2evolution.net/, where you can browse plugins by category and version.

There is also a fresh PluginsRepository hosted by SourceForce.net.

You can also view all the plugin information here on the wiki by clicking on the Category:Plugins link. This includes details of many specific plugins available for b2e.