themifyme

Easily create metaboxes for your posts and custom post types, or for user profiles. 
Please note, this plugin is intended for developers, to see how to use this plugin you can checkout the “example-functions.php” file inside the plugin.
Supported field types
<ul>
<li>textbox: general text input</li>
<li>image: image uploader, allows user to upload images directly or use the WordPress media browser</li>
<li>video: same as “image” but only allows uploading video files</li>
<li>audio: same as “image” but only allows uploading audio files</li>
<li>dropdown: multiple choice select field</li>
<li>radio</li>
<li>checkbox</li>
<li>color: color picker</li>
<li>date: date and time picker, with options to change the formatting of the date</li>
<li>gallery_shortcode: upload and select multiple images</li>
<li>multi: allows displaying multiple fields in the same row</li>
</ul>

Themify Metabox

Metabox creation tool with advanced features.

freedimensional

The most common ways for people to subscribe to a blog and its content are through RSS, Email and Twitter. Some people syndicate to Facebook too. This plugin places related subscription icons in a widget area and lets users enter their own feed or page URLs and select the colour of their icons. Its really simple but theres lots of power under the hood.
<h4>Features:</h4>
<ul>
<li>Offers an attractive range of subscription options for your readers using familiar-looking icons.</li>
<li>Intuitive interface for editing options, including your feed or page URLs, widget title and icon sizes.</li>
<li>Independent handling across multiple widget instances, using WordPress 2.8’s widget_class coolness.</li>
<li>Ability to select any colour, via HEX code or <a href="http://www.w3schools.com/html/html_colornames.asp" rel="nofollow ugc">HTML Color Name</a>.</li>
<li>Integration with the <a href="http://digitalcortex.net/plugins/subscription-options/addon-pack" rel="nofollow ugc">Subscription Options Add-on Pack</a>.</li>
</ul>

Subscription Options

Adds subscription option icons for your RSS Feed; your FeedBurner Email Service; your Twitter Stream and your Facebook page. Totally user-defined.

Themify Metabox vs Subscription Options