DuncanMarshall

This widget displays the current star sign, your zodiac sign, or a calculator to let users pick their’s.
<ul>
<li>Clean, simple, and responsive design fits well with any theme</li>
<li>Keeps users coming back to your site.</li>
<li>Works equally well on desktop or mobile.</li>
</ul>
The widget renders html anchors to static alternatives for users with NoScript, but requires you to enable this feature.

Show Star Sign Widget

A sidebar widget to display a star sign - yours, or the current sign.

Glenn Ansley

fullthrottledevelopment

This simple little plugin gives each author on your blog the ability to setup a signature and to include it at the bottom of their posts.
The admin screen gives each author the ability to format their signature (a text area with HTML formatting enabled) and to indicate whether or not they want the signature on or off by default.
Regardless of the default setting, your authors may toggle the inclusion of the signature to ‘on’ or ‘off’ for each individual post at the bottom of the Write Post and Edit Post screens.
=Release History= 
 1.4 – Updated for WordPress 3.5. 
 1.3 – Fixed a bug that caused signatures not to show up on certain server configs. 
 1.2 – Moved Signature Management to profile page. 
 1.1 – Fixed a bug that prevented writing / editing pages. 
 1.0 – Initial Release

FT Signature Manager

FT Signature Manager allows your authors to create a signature to be appended to the end of their posts.

Show Star Sign Widget vs FT Signature Manager