Frontend: Views
Comment Spice
Spice up your comments area with goodies like commenters twitter or last posted article link and nofollows by rules.
Disqus comments
Disqus.com is a webservice that allows you to manage comments, with central logins. It stores and manages comments outside of your Serendipity installation, and is embedded using JavaScript. For more information see disqus.com.
Enhanced Comment Area
Uses JavaScript to show a live preview and markup-buttons
Facebook (Experimental!)
Imports comments made on facebook postings (like through RSS Graffiti) back into the blog. Also embeds Facebook OpenGraph Meta-Tags into the blog. Note that adding "like"-Buttons to blog entries is achieved via the serendipity_event_findmore plugin!
Frontend entry filtering
Allows visitors to filter/order your entries by several options
Microblogging (Twitter,Identica)
Adds a twitter/identica client to the admininistration interface, searches for tweetbacks and announces new articles to a microblogging account.
Newsbox
Group a category's entries in a frontpage box instead of the usual article listing. Supports nested newsboxes.
Properties/Templates of categories
This plugin provides additional properties for categories and their entries, including custom templates, sort order, display limit, password protection, and RSS hiding.
Realtime Comments
Load comments made from other users without reloading the page.