fullo

The Ribbon Manager plugin give the ability to add a side ribbon on the blog without touching the template file or the css. 
Please note that the plugin needs a theme with <code>wp_head();</code> and <code>wp_footer();</code> enabled.
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FCC Ribbon Manager

The Ribbon Manager plugin give the ability to add a side ribbon on the blog without touching the template file or the css.

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duckinformatica

gab.lau

Puts a ribbon on the website if the user browser is older than expected.
Minimum browser versions are customizable in the Settings menu, along with the title and a custom link. 
Now you can set the position and the image of the ribbon. 
This plugin has full support for translation into other languages
For more informations: http://www.duckinformatica.it/prodotti-e-servizi/free-wordpress-plugins/
This plugin uses the Browser detection library built by [Chris Schuld] https://github.com/cbschuld/Browser.php

Browser Update Ribbon

It would be nice to see some guidance on version numbers - is it best practice to always use the lastest version?  If so shouldn't the plug in get that info from somewhere?  If not, then what?  
For now I'll rely on the defaults that are set when you first install it, but maybe the author will stop updating in the future...?  What then?



Works, but...

Puts a ribbon on the website if the user browser is older than expected.

FCC Ribbon Manager vs Browser Update Ribbon