InContext

Comments are extremely critical for the success of a blog. All existing blog platform and commenting plugins only let readers add comments all the way at the bottom of a post, out of the context of the content in the post. When you write a long blog post with, say, 10 paragraphs, and readers are commenting on a particular statement or expression in paragraph 3, they have to scroll back and forth to read the context to figure out what the comments are about. The “In-Context Comment” plugin changes that: Now you can add an “In-Context Comment” icon using <in-context-comment:here:tag> (where “tag” is any word or words connected by hyphen ) at any place you want readers to comment on and they will be able to click and open a window to add comments right there, next to the context so other readers can see both the context and the comments in one glance. The comment window automatically closes when a reader clicks the cursor anywhere outside the comment window so it does not interfere with the reading.
This plugin can also help you grow your readership by posting the comments to the commenters’ Facebook and Twitter status updates to bring in new readers to your blog. 
You can also configure the “In-Context Comment” plugin to automatically add a comment icon at the end of each paragraph that is longer than a certain number of characters. This auto feature is enabled by default with a minimum character count of 360. Please go to the plugin’s Settings page to change.
<h3>Documentation</h3>
Visit http://wizag.com/incontext.php for example and documentation

In-Context Comment

"In-Context Comment" lets readers leave comments right next to the content being commented, instead of only at the bottom of the blog post

OTWthemes

Widget Manager gives you full control over widget visibility via nice and easy interface.
Every widget can now be displayed on or hidden from one or few pages. Display relevent content on your pages, posts, categories, tags, archives, custom post types, custom taxonomies, page templates, WordPress service pages, etc..
<blockquote>
Upgrade to the Pro version of this plugin – the worlds most complete Sidebar and Widget management system for WordPress including regular updates and premium support: 
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</blockquote>
Display widgets based on language(WMPL plugin) or user role is available as well.
Support for WooCommerce plugin, bbPress plugin and BuddyPress plugin has been added too.
This plugin works with all widgedets – WordPress default and any custom added widget.
The interface is very intuitive and requires no coding knowledge at all.
How Widget Manager Light works
<ul>
<li>Go to Appearance -> Widgets.</li>
<li>Select a Widget in any sidebar.</li>
<li>Click on the Set Visibility button.</li>
<li>Select where to display on or hide from.</li>
</ul>

Widget Manager Light

Widget Manager lets you control on which pages widgets appear via nice and easy interface. Show or hide widgets. Display relevant content on your page …

In-Context Comment vs Widget Manager Light