The Ping-O-Matic plugin sends a ping http://pingomatic.com/ after you publish a post. Ping-O-Matic is a service that updates different search engines letting them know that your blog has been updated.
The Generic ping plugin can be used to add a generic RPC ping service to your blog.
The OpenID Plugin provides OpenID authentication for b2evolution.
Creates tag links following Blogalaxia's format.