Jan Štětina

Includes custom HTML/CSS/JS code in the section on every blog in the network.
Very simple, but sometimes useful plugin.
After activation visit Network Admin –> Settings –> Multisite wp_head Code for setup. Nothing else is needed.
Developed for private use, but has perspective for more extensive usage. I can’t guarantee any support in the future nor further development, but it is to be expected. Kindly inform me about bugs, if you find any, or propose new features: <a href="mailto:zaantar@zaantar.eu?subject=[multisite-wphead-code]" rel="nofollow ugc">zaantar@zaantar.eu</a>.

Multisite wp_head Code

Includes custom HTML/CSS/JS code in the  section on every blog in the network.

Fredrik Malmgren

With Clean up wp_head you can easily remove all those unused tags in wp_head.
<h4>Usage</h4>
<ol>
<li>Go to ‘Clean up wp_head’ under ‘Settings’ menu</li>
<li>Change the options of your choice</li>
</ol>
Follow the development of this plugin at <a href="http://fredrikmalmgren.com/wordpress/plugins/clean-up-wp-head/" title="Clean up wp_head - Fredrik Malmgren" rel="nofollow ugc">FredrikMalmgren.com</a>.

Clean up wp_head

Use Clean up wp_head to remove unused tags in wp_head.

Multisite wp_head Code vs Clean up wp_head