The Auto P Plugin will do the following:

• Single line breaks will be converted to <br />;
• Paragraphs of text separated from each other by double line breaks (i-e: empty lines) will be converted to <p>paragraph</p>.

This renderer automatically creates links for you.

• URLs can be made clickable automatically.
• Specific and frequently used terms can be configured to be automatically linked to a definition URL.

This plugin provides a widget that displays a navigable calendar.

For more information on the widget provided by this plugin, please see: Calendar Widget

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.

You do not need this plugin with b2evo 2.0.x which has embedded support for categories.

Check Blog settings > Category List Widget