cavimaster

Show content of any selected page in a widget.
In the back office, on your post page, check the checkbox “Add this page on widget”. 
This selected page, appears finaly in your “Page on widget” widget. 
Drag and drop your widget on widget-zone like you want. 
Show or unshow the page title 
Limit content lenght with number of words. 
Custom the read more link.
<h4>Exemple</h4>
<ul>
<li>create a widget zone in top of the home page on your custom template</li>
<li>Select with the checkbox your welcome or about page on back-office</li>
<li>Put the “page on widget” widget on your new widget-zone</li>
<li>You ave now home page with first, a welcome or about page and after the normal posts order</li>
</ul>
Widget options: show or not page title || limit words of content || “read more link” custom
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<a href="http://www.devsector.ch/cavimaster/category/developpement/" rel="nofollow ugc">Cavimaster blog</a>

Page on widget

Show content of any selected page  in a widget

scriptburn

This plugin excels in giving you full control over the visibility of your a post. By default, any post you add to your WordPress blog will become the topmost post, and will show up immediately on the front page in the first position, and similarly in category/tag/archive pages. Sometimes, you want to create a “low-profile” addition to your blog that doesn’t belong on the front page, or maybe you don’t want it to show up anywhere else in your blog except when you explicitly link to it. This plugin allows you to create such “hidden gems”.
In particular, this plugin allows you to control the visibility of a post in various different views:
<ul>
<li>The Front Page (Homepage, depending on your theme, this may not be relevant)</li>
<li>The Category Page (listing the posts belonging to a category)</li>
<li>The Tag Page (listing the posts tagged with a given tag)</li>
<li>The Authors Page (listing the posts belonging to an author)</li>
<li>The Archive Pages (listing the posts belonging to time period: month, week, day, etc..)</li>
<li>The Search Results</li>
<li>Feeds</li>
</ul>
The posts will disappear from the places you choose them to disappear. Everywhere else they will show up as regular posts. In particular, permalinks of the posts still work, and if you generate a sitemap, with something like the <a href="https://wordpress.org/extend/plugins/google-sitemap-generator/" rel="ugc">Google XML Sitemaps</a> the post will be there as well. This means that the content of your post will be indexed and searchable by search engines.
For a WordPress page, this plugin also allows you to control the visibility with two options:
<ul>
<li>Hide a page on the front page (homepage) only.</li>
<li>Hide a page everywhere in the blog (hiding the page in the search results is optional).</li>
</ul>
This means, technically, whenever pages are listed somewhere using the <code>get_pages</code> filter, this plugin will kick in and either filter it out or not according to the options you choose. The same rules apply regarding permalinks and sitemaps as they do for regular posts.
“WP Hide Post” plugin is a great tool in your arsenal for SEO optimization. It allows you to add plenty of content to your blog, without forcing you to change the nature and presentation of your front page, for example. You can now create content that you otherwise would be reluctant to add to your blog because it would show immediately on the front page, or somewhere else where it would not belong. It’s a must-have feature of WordPress.
Please enjoy this plugin freely, comment and rate it profusely, and send me feedback and any ideas for new features.
<h3>Development Blog</h3>
Please visit the plugin page at <a href="http://scriptburn.com/wp-hide-post/" rel="nofollow ugc">ScriptBurn.com</a>, and feel free to leave feedback, bug reports and comments.

WP Hide Post

Control the visibility of items on your blog by making posts/pages hidden on some parts , while still visible in other parts and search engines.

Page on widget vs WP Hide Post