Create and Communicate

Evver is a free web app which allows you to create music slideshows with extreme ease. You simply select your favorite pictures (from 10 to 100), you pick up a song, among the available soundtracks, and the rest is automatically done for you.

You can re-arrange the order in which the photos will be shown in the final video and delete the ones that you don't want to use and you are set to go.

Evver edits your pics in sync with the music and creates a music video that can be easily shared on any social media or embedded to your site or blog.

My comment: Very, very easy to use. The selection of music tracks that you can use is presently very limited. The final result is good, but - as you can see from my sample - not as good as it could be. 
 

Free to use.

Try it out now: http://www.evver.com/ 

Similar tools: http://slide.ly 

Sample video (created by me): http://www.evver.com/play/49ef08ad6e7f26d7f200e1b2b9e6e4ac