Core Design Anonymous Links plugin for Joomla!
With this plugin you can prevent your site from appearing in the server logs of referred pages as referrer.

Core Design File ACL plugin (FACL) for Joomla! 1.5
System plugin (based on simple file structure) that allows additional control over your articles, categories and sections as well.

Plugin for Joomla! administration that enables the Ajax power to core Joomla! operation like (un)publish article, toggle frontpage etc. reloading free! Just do your work with Joomla! happier, less stressful and very productive!

The brand new, Ajax powered Pagebreak plugin brings the web 2.0 into your website. Lightweight, ultrafast and hassles free way to navigate between your site's pages! Now you don't need to wait when the server will load the next page - Ajax Pagebreak will do that 10x faster! Many Joomla! users already found it extra useful and revolutionary! It's a step ahead in the Joomla! development!