You can learn a lot about how b2evo plugins work by installing the Test plugin and looking at it’s source. This can be very helpful if you want to create your own Plugin.

This plugin allows the use of [stars:] short tag to render star ratings inside collection posts and comments.

The PRISM plugin for b2evolution provides syntax highlighting capabilities based on the Prism project.

This plugin provides the [poll:] inline short tag to render polls inside your posts.

This is a renderer plugin that implements the text transformation of Markdown syntax for HTML formatting. Due to its specific markup you could create HTML elements in a fast and comprehensive way.