OopsTouch

SlideshowFx will take a given Picasa username or Flickr user ID and fetch a listing of all public albums for the given user. Thumbnails to the individual albums will be displayed in a table on the specified WordPress page.
Please note that this plugin requires PHP5 or higher and cURL library.

SlideshowFx

Gets a listing of Picasa/Google+/Flickr Web albums and displays album thumbnails on your page.

portablecomp

Want see all images from your DropBox Public folder? 
Want show your readers your recent photos in sidebar gallery of your blog? 
It’s fast and easy way to show your photos from any event in your life:
<ul>
<li>Last party</li>
<li>Vacation</li>
<li>Family holidays</li>
<li>Pets</li>
<li>Cars</li>
<li>and any pictures you want to public</li>
</ul>
Now any important images can be viewing in minutes!
Before ShowBox installation:
<ol>
<li>Launch your DropBox</li>
<li>Click on DropBox tray and select “Open Dropbox folder” </li>
<li>Open your Dropbox “Public” folder</li>
<li>Open your explorer </li>
<li>Drag and drop images you want to show from your explorer to your Dropbox “Public” folder</li>
</ol>
Five easy steps::
<ol>
<li>Open your blog admin widget page: http://yourblog.com/wp-admin/widgets.php 2. Open ShowBox widget 3. Click on “Log in to Dropbox” button. Then you’ll be redirected to Dropbox site</li>
<li>Please enter your Dropbox login 
 5. After you ‘ve been logined successfully, please open your blog main page http://yourblog.com</li>
</ol>
And let all your readers estimate what ‘s important for you. That’s all. Enjoy!

ShowBox

Any images, photos, pictures from your DropBox Public folder now are accessible to view in sidebar gallery of your blog.

SlideshowFx vs ShowBox