nosoycesaros

A WordPress plugin designed to mark posts by logged in users. Allows theme developers and administrators create and edit post flags, like favorites, seen, likes, etc, also provides an easy way to put this flags in your theme via shortcode.
Features:
<ul>
<li>Administrators can create flags like ‘Favorites’, ‘Seen’ or ‘Bookmark’ for early use</li>
<li>You can create as many flags as you want</li>
<li>Allows customization of HTML code for each flag</li>
<li>Insert in themes and post via <code>[shortcode]</code></li>
<li>This plugin creates favorite flag and button by default</li>
</ul>

Post Flagger

Add Favorite or any flag button to your posts. The easy way

ab-tools

A simple plug-in that displays flag icons.
This plug-in does not provide a way to translate posts directly, but offen you do not want a direct translation of posts. Still you want to add flag icons that link to other language versions of your blog.
After installation of this plug-in a new widget will be added that you can use to display such flag icons on your blog. A set of flag icons is included, but if you want to use your own images that’s possible, too.
<h4>Additional info, support and developer contact:</h4>
<ul>
<li>English: http://www.ab-weblog.com/en/wordpress-plug-ins/flags-widget/</li>
<li>German: http://www.ab-weblog.com/de/wordpress-plug-ins/flaggen-widget/</li>
</ul>
Please let me know if you find a problem with this plug-in or have questions!
<h4>You can see this plug-in in action on posts of this blog:</h4>
<ul>
<li><a href="http://www.ab-newsonline.com/en/" title="Read Current News Online at AB-NewsOnline.com" rel="nofollow ugc">Read Current News Online at AB-NewsOnline.com</a></li>
</ul>
If you like this plug-in, please <a href="https://www.paypal.com/cgi-bin/webscr?cmd=_donations&business=donation%40breitschopp.de&item_name=Donation%20for%20Flags%20Widget%20WordPress%20Plug-In&no_shipping=0&no_note=1&tax=0&currency_code=EUR&lc=CA&bn=PP%2dDonationsBF&charset=UTF%2d8" title="Donate With PayPal" rel="nofollow ugc">consider a donation</a> to keep it free. Thank you! 
… and please don’t forget the 5 star rating, if you like this plug-in. 🙂

Flags Widget

A simple plug-in that displays flag icons that link to other language versions of your blog.

Post Flagger vs Flags Widget