Google is now offering their Nik Software collection for free. It is an extensive set of software plugins for Photoshop, Lightroom, Elements plus.
I downloaded them and viewed a video on how to use them from the same web site. An impressive set of tools but it might take a while to master.
Google for – www.google.com/nikcollection/ – to download.
Training is also available at: http://greylearning.com/courses/nik-bundle