WebMaestro.Fr

Upload the layers of your image, and create a parallax effect !
It works great on smart devices too !
The first step is to create with your favorite picture editing software (Photoshop, GIMP…) an independent image for each ground composing your image. All these layers shall be the same size, and should be in .png format as they are meant to include transparency areas. 
Then, on your post editing page in WordPress, click the Insert Media button, and (the same way you would create a gallery) upload your layers under the Create Parallax item. Reorganise the layers if needed, from the background to the front. 
You can finally configure the animation (calibrate, invert, limit, scalar, friction), and publish !
There is <a href="http://webmaestro.fr/image-parallax-plugin-wordpress/" rel="nofollow ugc">some examples</a> on the plugin page.
It uses <a href="http://wagerfield.github.io/parallax/" rel="nofollow ugc">parallax.js</a> by Matthew Wagerfield.

Image Parallax

Create images with a parallax effect. Upload some layers, configure the animation, and publish !

wp-maverick

MBA Multimedia

WP Parallax Content Slider is a plugin which adds automatically a content slider of your last posts where you want on your WordPress blog or website.
This plugin is written upon the code of <a href="http://tympanus.net/codrops/author/crnacura/" rel="nofollow ugc">Manoella Ilic</a>, you can see the simple JQuery and CSS version <a href="http://tympanus.net/codrops/2012/03/15/parallax-content-slider-with-css3-and-jquery/" rel="nofollow ugc">here</a>.
Transitions between slides are made using a powerfull combination of CSS3 and JQuery to display a beautiful parallax effect.
It is very easy to configure the plugin as it adds automatically an admin page in WordPress administration section. You will be able to configure :
<ul>
<li>New in v0.9.4 : Filter by post category directly with a shortcode parameter (eg. [parallaxcontentslider categ=”2″] or [parallaxcontentslider categ=”2,5″]);</li>
<li>The type of content to display (posts, pages, both);</li>
<li>The number of slides to display;</li>
<li>The auto-switch mode;</li>
<li>The time between each slide;</li>
<li>The sort order of the content to display;</li>
<li>The graphic theme;</li>
<li>and many more…</li>
</ul>
It’s also possible to choose to display a static HTML content instead of displaying last posts in the slider.
WARNING: This last feature is dangerous since all plugins files will are deleted by WordPress during an automatic update! Be careful if you use it and backup your files.
Roadmap:
<ul>
<li>Static slides in a new dedicated custom_post_type;</li>
<li>Better shortcodes;</li>
<li>Add a parameter to use an external CSS file to customize CSS styles;</li>
<li>Add extra parameters to the admin panel (Sizes, colors,…);</li>
<li>Better touch support;</li>
<li>and many more…</li>
</ul>
Available translations:
<ul>
<li>English: Julien Le Thuaut</li>
<li>French (fr_FR): Julien Le Thuaut</li>
<li>Russian (ru_RU): <a href="https://wordpress.org/support/profile/temur-danelia" rel="ugc">Temur Danelia</a></li>
<li>Georgian (ka_GE): <a href="https://wordpress.org/support/profile/temur-danelia" rel="ugc">Temur Danelia</a></li>
<li>Polish (pl_PL): <a href="https://wordpress.org/support/profile/snecz" rel="ugc">snecz</a></li>
<li>Turkish (tr_TR): Batuhan Büyükgüzel (Partial translation: 65%)</li>
<li>Dutch (nl_NL): Marieke_Louise</li>
<li>German (de_DE): Jan Holthuis</li>
<li>Spanish (es_ES): Germán Díaz de Rada</li>
<li>Arabic (ar): Mohamed Kawsara</li>
<li>Arabic Syria (ar_SY): Mohamed Kawsara</li>
<li>Portuguese (pt_BR): Thiago Passamnai (Partial translation: 60%)</li>
<li>Serbo-Croatian (sr_RS): <a href="http://www.webhostinghub.com" rel="nofollow ugc">Borisa Djuraskovic</a></li>
<li>Czech (cz_CZ): <a href="https://www.transifex.com/accounts/profile/boobinna/" rel="nofollow ugc">boobinna</a></li>
<li>other languages (xx_XX): Translators needed 😉 See the FAQ</li>
</ul>
<h4>Plugin’s Official Site</h4>
You’ll find more informations on the WP Parallax Content Slider plugin page <a href="http://jltweb.info/realisations/wp-parallax-content-plugin/" rel="nofollow ugc">here</a>.

WP Parallax Content Slider

A customizable JQuery content slider with CSS3 animations and parallax effects.

Image Parallax vs WP Parallax Content Slider