Vladimir Garagulya

apgossips

This plugin enables you to have a side bar widget with slider (slideshow) of featured images from recent posts (custom post type), 
from a selected category (hierarchical taxonomy), from comma separated list of tags. If post has no featured image, plugin tries 
to extract any 1st image from that post content. Customize post title and background color, background color of slider navigation panel. 
Color is selected from WordPress built-in color pallete. Manual input is available also. Select animation type: slide or fade. 
Setup slider speed and widget dimensions. You can have as many sliders as you wish with different categories. 
This is mainly useful if you have a dedicated category for photo gallery posts and would like to display recent post title with its featured photo.
<h3>Translations</h3>
<ul>
<li>Russian: <a href="http://shinephp.com" rel="nofollow ugc">ShinePHP</a></li>
</ul>

Posts Slideshow Widget

This plugin enables you to have a side bar widget with slider (slideshow) of featured images from posts from a selected category.

Julian M.

This is a very simple plugin created to embed PowerPoint presentations using SlideOnline.com in any blog powered by WordPress.
You can easily embed your PDF and PowerPoint presentations in a WordPress blog using <a href="http://slideonline.com/" title="Share PowerPoint Online" rel="nofollow ugc">SlideOnline.com</a> that is a free service to share PowerPoint presentations online and an alternative to other PPT and presentation sharing platforms.
You can see a real example here: http://www.free-power-point-templates.com/articles/create-presentations-that-marvel-and-excite-with-eugene-cheng/

SlideOnline

Easily embed your presentations in a WordPress blog. SlideOnline.com is a free service to share PowerPoint presentations online.

Posts Slideshow Widget vs SlideOnline