If you want to jazz up your WordPress and Joomla installations then add a new (and free!) theme to your website, we have picked out some of our favourite ones below.

Free WordPress Themes & Templates

Easily change the look and feel of your WordPress installation by incorporating a new theme.
Below is a list of FREE WordPress Templates that you can download and install.

1. Free WordPress Themes at Fresheezy
http://www.fresheezy.com/

2. WordPress Free Themes
http://www.wpfreethemes.com/

3. WordPress Templates
http://wordpresstemplates.name/

4. WordPress Themes Archive
http://www.wpthemesarchive.com/

5. Top WordPress Themes
http://topwpthemes.com/

Plugins:
You can also install plugins to extend the functionality of your WordPress installation.

The official plugin website of WordPress contains a huge resource of add-ons that are categorised so you can find what you are looking for fast.

Official Plugin Website:
http://wordpress.org/extend/plugins/

Joomla Themes & Templates

1. Free Joomla Templates
http://joomlatp.com/

2. Theme Base Joomla Templates
http://www.themesbase.com/?category=joomla

3. Royalty-free Joomla Templates
http://joomla2u.net/

4. Best of Joomla Templates
http://www.bestofjoomla.com/

5. Rocket Theme Free Joomla Templates
http://www.rockettheme.com/Free-Joomla-Templates/

Plugins & Extensions
Extend the standard functionality of Joomla by installing add-ons. The official Joomla website offers over 3000 extensions for you to use with your Joomla installation.

Official Extension website:
http://extensions.joomla.org/