Codstack

<p><a href="http://www.youtube.com/watch?v=T_J67i9yKr8" rel="nofollow ugc">Demo</a><br />
This wordpress plugin enables you to have a dynamic sidebar in a way that you can post automatically in there. By this plugin you can add and remove your widgets automatically. You set your Start Date and End Date in the plugin and everything will be done for you! For instance you want to insert a banner or advertisement for the coming new year but you can not do it just at the exact coming new year time! So whenever you have time you can set a future Start Date and an End Date in this plugin and everything is just done with that! The plugin itself inserts your banner at the given Start Date and End Date. For another example you can make a deadline for your banner by just giving an End Date in the plugin and the banner starts but will be removed on the End Date automatically.</p>
<p>There are three different ways:</p>
<p>1) Manually</p>
<p>It is just like HTML Text Widget but you can use Twitter Bootstrap Classes, access to Media Library and insert links and images easily and quickly.</p>
<p>2) Automatically</p>
<p>Rather than all of the features in “Manually” you can set a Start Date and an End Date for your widget so your widget will be shown on your website at your Start Date that you have just set and will be removed at End Date that you have just set. NOTE: If you want to use this type you must have another active widget ( with any type ) in your sidebar.</p>
<p>3) Deadline</p>
<p>Beside all of the features in “Manually” type, there is an End Date that you can set and when you active this type of widget it will be shown in your sidebar and whenever it reaches to its End Date it will be removed from your website automatically.</p>
<p>Automatic Widgets Meta Box ( in WordPress Dashboard menu )</p>
<p>Here you can view all of your “automatically and deadline” widget types. You can see when they are started or ended. For instance you can see which “automatically” types are going to be started or which “deadline” types are going to be removed form your sidebar. It is actually your statistics of automatic widgets.</p>
<p>We hope you like it, thank you very much indeed.</p>


wp_automatic_widget

This wordpress plugin enables you to have a dynamic sidebar in a way that you can post automatically in there.

Justin Tadlock

<p>The My Snippets plugin allows you to define custom widget content on a per-post basis from the edit post screen.</p>
<p>While the plugin is both simple and powerful, it’ll never replace such plugins as Widget Logic and Widget Context nor is that the plan. What it does is allow you to add custom widget content from the edit post screen without having to go to your Widgets screen in the admin for additional configuration.</p>
<h3>Features:</h3>
<ul>
<li>Post-by-post (or any public post type) widget content that you control.</li>
<li>Extra widget for use on your site.</li>
<li>Easy-to-use snippets settings box on the post editor.</li>
<li>Supports HTML and shortcodes.</li>
</ul>
<h3>Professional Support</h3>
<p>If you need professional plugin support from me, the plugin author, you can access the support forums at <a href="https://themehybrid.com" rel="nofollow ugc">Theme Hybrid</a>, which is a professional WordPress help/support site where I handle support for all my plugins and themes for a community of 70,000+ users (and growing).</p>
<h3>Plugin Development</h3>
<p>If you’re a theme author, plugin author, or just a code hobbyist, you can follow the development of this plugin on it’s <a href="https://github.com/justintadlock/my-snippets" rel="nofollow ugc">GitHub repository</a>.</p>
<h3>Donations</h3>
<p>Yes, I do accept donations.  If you want to buy me a beer or whatever, you can do so from my <a href="http://themehybrid.com/donate" rel="nofollow ugc">donations page</a>.  I appreciate all donations, no matter the size.  Further development of this plugin is not contingent on donations, but they are always a nice incentive.</p>


My Snippets

Allows you to add custom widget content on a post-by-post basis from the edit post screen.

wp_automatic_widget vs My Snippets